Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7b83b2c1bc8f3e…

MALICIOUS

PDF

77.7 KB Created: 2021-03-09 02:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dde10a038e6c01d1a8c55cff0f874a4b SHA-1: a4c7d48e159a46556316887a52d9432f02f58315 SHA-256: 5a7b83b2c1bc8f3e7e3b4eefc2211ccfa317d306a24d775df10de8fc6e3cdfc5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/aws?utm_term=paparazzi+lady+gaga+ukulele+chords PDF link annotation
    • http://parralax.net/keduwizivebimix76k.pdfIn PDF document text
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/1356401.pdfIn PDF document text
    • http://fruitslope.online/209477555300xofl.pdfIn PDF document text
    • http://wordsidepost.top/xanodalumepodomimamowuja7d347.pdfIn PDF document text
    • http://sberbank.link/firefox_app_free_for_laptop1u8bb.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/2811021.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/2866337.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/55306778919ywp9l.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/2957818.pdfIn PDF document text
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/jegopejotaradagowex.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
    • https://s3.amazonaws.com/jamuluvuvava/electric_wheelchair_drum_cadence_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37292631-3bfb-4ae3-9554-cb72c68abd8d/jawbone_jambox_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419a0a7e-1cf4-4d0e-ae73-a17aee4c5edb/leisure_time_word_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6f0d12-c9be-48b6-a288-389b64625eec/what_is_the_best_haircut_for_a_black_man.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/gamegibesedokinapov.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_c414ce1a97f44bbabba3a29a0811edb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95343bd-6865-4797-958c-26a4186e9bd5/what_is_the_mpg_for_a_dodge_2500_diesel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cdb0d6-8198-4d3d-8f42-a7eb92221d44/zasazugasilek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a195507-3611-4a1d-9370-2790f4842b56/98526861300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5fe4d9-3469-4e40-b1c2-8b4e62b10fe3/how_do_i_clean_my_philips_respironics.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/front_page_newspaper_template.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_7217ce84df9749cd9da762a1cac7e75b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lulelepese/how_to_use_procreate_for_ipad_pro.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5248 bytes
SHA-256: 7b4ac2981d9162bcd5c7ce9131baeb3ec1786cc7667a02607b9a25c47f3a4bb1
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 11212 bytes
SHA-256: 97d078421679a6d3de4f57eb16821cfb988351540d7cbfd7b69d80801d813451
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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