Malicious PDF — malware analysis report

Static analysis result for SHA-256 f750a931a17c0035…

MALICIOUS

PDF

92.9 KB Created: 2021-06-10 04:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f8e225efc2feed9996646f7ae8d73c2a SHA-1: 4c7c0e25335329f45f1d8c9a332868d441ab3c18 SHA-256: f750a931a17c0035a1d8271ae269abb0591747c915ca23f6c78606e4aa506ced
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a specific focus on SEO manipulation. The primary URL, 'https://krisoc.ru/pbw?utm_term=rock+and+roll+roller+coaster', suggests a potential phishing or scam lure, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/pbw?utm_term=rock+and+roll+roller+coaster PDF link annotation
    • https://lijotabele.weebly.com/uploads/1/3/4/0/134016876/gilemo_kiliweminu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_6007a7ba35972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_6038d3e9be111.pdfIn PDF document text
    • https://sejaworobe.weebly.com/uploads/1/3/4/8/134865602/mofoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5fe942767701b.pdfIn PDF document text
    • https://nofevezim.weebly.com/uploads/1/3/4/7/134770192/zawogabod-jibiramoj-rulatelunozo-pejufunabuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_6013b37bb8875.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5ff20ca277b25.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/xokoxeziwel_tupibiresumuj_firizawub_bokifurewis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tirotibixup.pbworks.com/f/21921457088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a00ed70-0e01-407a-ace2-a68ced2be709/convertir_mm_a_pulgadas_de_agua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9de5097-634a-46a3-b3ea-968c5d48dddd/busugejob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274ec7e7-91ab-4ac1-a97c-7123dd31821e/how_to_factory_reset_asus_router_ac1900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b4311-16a9-4cce-aa03-ab1ba75deef0/lavoxesarixisesog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79a96b5-c07f-4dee-892e-a746438596dd/danby_12_000_btu_portable_air_conditioner_with_silencer_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be848c92-6955-4a73-8821-a938b25e0988/pokemon_x_and_y_emulator_pc_free_download.pdfIn PDF document text
    • http://dimutojopog.pbworks.com/w/file/fetch/144799443/23422691909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96520300-91f4-4acd-a58a-dc1b5f3d23df/sig_sauer_p320_kydex_holster_owb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d53723-eb9e-4a16-b705-5b6b679b6309/32061481875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fc818f-efd4-41f7-8e57-fd8eb66b10bc/hannah_montana_movie_songs_climb_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab545027-49fb-496d-a558-96f2abb6323b/iso_22000_checklist_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0331065-251b-4be2-bc6f-e4d4042aded8/do_kitchenaid_mixer_attachments_fit_all_models.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 4744 bytes
SHA-256: a783b65290a2c50d8e67e477be2e4ce29065f7c2c7cdd0ee453255de3e54d143
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 2356 bytes
SHA-256: 0121dc1764935b3f536a42de7666cb58e82e2fc9349e27e92da1a8c8f602ee65
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 11672 bytes
SHA-256: fcada4f83c6dc6839ff0b094778ce9076c51ac98a2c53150e16c19b865c79157
font_03_sfnt_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 16960 bytes
SHA-256: 1530402f12c803d23e3161f853a34608a18616334e646e6fbcc630d95e5c8f5e
font_04_sfnt_off00015543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15543 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230