Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3adb95160c8b3b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-13 12:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f49e50e5fa164548248203ee6faf882b SHA-1: 5af63bd4d03596057f41be1cc1abb2bcbf878cc2 SHA-256: da3adb95160c8b3b68d4d420b72afcffe3a4a55c774b43f7c9b5798aad082356
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on 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 external link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=nvs+pgt+answer+key+2016+pdf PDF link annotation
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/kutipod.pdfIn PDF document text
    • https://povazolanatul.weebly.com/uploads/1/3/0/7/130740072/6132976.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/7840633.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/de1095a547c15.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/6658102.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://uploads.strikinglycdn.com/files/1c33505f-26e9-4a2a-8f07-f290b51a581e/todos_los_tipos_de_funciones_del_lenguaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902008ac-978a-41ae-8722-f3f9ed23f679/what_does_code_1e_mean_on_samsung_washer.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/xefitibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e7019a-3fad-4742-8b83-ba94edded872/jitogojukajusetogaki.pdfIn PDF document text
    • http://fuvotobike.pbworks.com/f/simple_present_tense_exercise_with_answer.pdfIn PDF document text
    • http://ralabasom.pbworks.com/f/watch_zombieland_2_online_putlocker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8dc817-0115-40b8-b09a-7786e3782b80/64752576449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fc3b35-0d35-4a4a-ae10-06a41b171231/why_my_kenmore_washer_will_not_spin.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416232/61307679533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cde98a1-a57d-4bf0-906d-7230b8906d21/68240302855.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144721800/random_video_call_on_google.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b8656c-e944-45fb-9128-3194483fcb98/craftsman_radial_arm_saw_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30088dac-6e25-4117-a400-f5f2fa5433a4/porter_cable_pancake_air_compressor_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2945e634-a304-49fa-8c2a-e5ce65493ddf/healing_from_hidden_abuse_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18df4fd4-8f58-44c2-a9b3-fdbb4dfe4f69/96749621949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b8473f-4079-4071-b2b5-e5b570ede65f/el_poder_de_la_esposa_que_ora_dia_3.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5572 bytes
SHA-256: 48a7a3212fae75446db9b117519d761a9f11c92ac4e5fb79ac0407fd8e8aa3d0
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 11224 bytes
SHA-256: eb89fb624619c74d202920367fd2fd4a67ae8a83681dc989316352ea20b16ca2
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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