Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff57e96c547cff9…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 21:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d886ba5df83f4f6180d2cce2d13fd015 SHA-1: ffbab4a5427dcb8398757a5f6bb63356bdd00b8f SHA-256: 2ff57e96c547cff9d1ff00e7da23bb15920798c5128c6ff7afbe296a2e835374
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, identified as a link farm. Several of these links point to disposable hosting and are likely used to redirect users to malicious sites or for SEO spam. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing or scam context, although the document body itself is heavily garbled and does not provide clear textual evidence of this. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/award?keyword=gray+s+anatomy+book+pdf+upper+limb PDF link annotation
    • https://vofodiwe.weebly.com/uploads/1/3/5/3/135350815/8ab2e25a56.pdfIn PDF document text
    • https://lefafikof.weebly.com/uploads/1/3/0/9/130969708/xagokuxojavev.pdfIn PDF document text
    • https://nozubewow.weebly.com/uploads/1/3/1/1/131164313/bc80746d0d.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/4690292.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/4467575.pdfIn PDF document text
    • https://wajevubal.weebly.com/uploads/1/3/4/6/134687537/1156285.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/5272597.pdfIn PDF document text
    • https://xasigebopij.weebly.com/uploads/1/3/0/7/130775268/nudig.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/32a99a6c-af02-42ba-96ea-2ee738d789ca/78004917073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bd93d3-7f70-4728-88ef-b83542022e94/transcendental_meditation_training_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21b0897-f232-4cdf-9944-3c114fb0698a/385212458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9688aed1-541c-4088-b4b1-5fd4d2da2b3b/portrait_photography_poses_female.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/fejeluxojukit.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/download_playstation_2_emulator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00001751-341e-4a29-8560-116351b4ae9d/how_to_upgrade_items_in_a_link_to_the_past.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37d1468-7f1b-4466-805e-cf602b1b708c/how_to_sketch_derivative_graph_from_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f50bf442-1250-402a-912b-bfa4d92b90a5/tatazi.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/41736994101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cb75f2-3b29-471a-bf81-23e1bde0604e/will_there_be_a_season_6_of_magicians_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/18968809309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3cb313-98c6-431a-b350-47302d5bec58/learn_python_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18f92a6-8be5-41ec-b355-755b5fd5a7bd/toro_724_snowblower_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/50738283606.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 5524 bytes
SHA-256: 8c73390f888e4d5cc0138fea68966f304967d0765b2e04bf5b89f5b639334fe5
font_01_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 10956 bytes
SHA-256: 7195caa0877eda589ede3547455541c21c7443c85df8652d4b4dbda1e5261f6f