Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b278db53e68c508…

MALICIOUS

PDF

81.4 KB Created: 2021-03-04 15:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b6314ffbe6fd8b94054a49157547494 SHA-1: 2222c71c318f06958022f80529f44d4453f4ce75 SHA-256: 3b278db53e68c50830022878a25f36c92963968cacf71cf4cd1f1842006af1f5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of a 'utm_term' parameter in one of the URLs further supports the idea of a campaign aimed at tracking user engagement with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=momentum+masters+book+review PDF link annotation
    • http://lelekelosutov.getenjoyment.net/chemistry_chemical_bond_worksheet_answers.pdfIn PDF document text
    • https://vukedezesul.weebly.com/uploads/1/3/0/7/130776134/sivazelowuxubemeja.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/memiguvuk.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/vovurokomanexif-pafofedo-monufakasuv-gadototenis.pdfIn PDF document text
    • https://rogelevosegadu.weebly.com/uploads/1/3/4/6/134651245/vazataxaxijob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff99de8-87e6-4757-91f4-55ccb0689e83/39643936722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d75ec2-0cb9-4ede-90a1-aad0c7bfaed8/mexuzosesabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf46374-24d3-4543-876f-cd091ddb1c31/ms_project_mac_os_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1dd3d6-c5c6-4274-bb25-b778806a7967/what_is_tribal_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9a0aec-cf39-49da-99b9-fe2a21349b5a/best_powder_for_reloading_subsonic_300_blackout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101bb440-ff84-4738-a65f-c112c9f8816a/craftsman_7.25_lawn_mower_parts.pdfIn PDF document text
    • http://vokesakogo.onlinewebshop.net/mewexix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f45331f-3cc6-479a-8c62-0cf142493058/gemini_alarm_system_trouble_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5ee3ef-f487-4b0f-8d12-f86797c3a480/satagixadelowekizutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1775924a-3ebd-455c-ac6b-759b647c2323/26158842207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bc4a1e-ec2d-4e56-9c97-0a272a8c9463/43942155855.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_4829a34a37aa42ba9c00c83714fcb0f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88fca2d-f3d8-4945-bdbd-d19731cc7107/zoom_g11_price_amazon.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_9908f820d318415cac6329aca3b67e82.pdf?index=trueIn 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_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5160 bytes
SHA-256: dae82d903106b2b5c43537ee19a3a0946755a6cc199c7dc24be284822df9ed78
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001134b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134B 10840 bytes
SHA-256: bf6a658bde30c4cb7e53f3c2f789c7888dcd0797ae8b08b506fdfbbd1687684d