Malicious PDF — malware analysis report

Static analysis result for SHA-256 f551ed9c5f71bc62…

MALICIOUS

PDF

69.2 KB Created: 2021-04-06 15:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 46c26ab663ffb9f39566462eb6c4c436 SHA-1: 5131724d6c0d88b5e06bb228e26eed86a9b325cf SHA-256: f551ed9c5f71bc6218b23e1a50d0bc4ef62184ed19c623fcb60a0910c7d11755
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=bible+niv+online+audio PDF link annotation
    • https://cdn.sqhk.co/vilubofi/ijhdie0/real_motors_llc_clearwater_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/e6EzdSz/71105343183.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/jgvwdgf/bluetooth_switch_headphones.pdfIn PDF document text
    • http://kuxuzozemoloxiv.22web.org/jegesibesajoboz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobagetebofuf.rf.gd/29765097621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f0eea4-50d4-4c96-8d38-a9a28f3f1dfa/5995441904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bb2b86-1da3-4960-9d42-debda2d833c0/swimming_to_lose_weight_mens_health.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_631b817ec35546a6b674633c648ea635.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fb5b11-4c69-42b0-9539-ca7c7d230ef5/gomugadaxilax.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/management_of_hypertension_guidelines_aha.pdfIn PDF document text
    • http://webenawawejoped.rf.gd/96750150072.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7b0c3d14e6b24fd99218fe6eafb1eaab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41488869-eda7-461b-a89e-58183f39e4a4/elkay_model_ezs8l_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6859e010-bb39-4962-8587-3b4fd6b20db7/simple_present_question_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a312f849-97f4-410e-add3-9081adea62a4/food_safety_modernization_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1538071a-6ed5-4700-b37f-2bb4cfc5946b/wojomawisoterawereronalom.pdfIn PDF document text
    • http://xofududegotu.epizy.com/ckd_guidelines_malaysia.pdfIn PDF document text
    • http://bazitobabin.epizy.com/gusufodaweweboxuxoju.pdfIn PDF document text
    • http://tivupizo.epizy.com/lifax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d9f66c-47f1-4ac2-a959-6ff2eaa38c54/pagututefulid.pdfIn PDF document text
    • http://nuzetewadan.epizy.com/8._4_angle_relationships_answer_key.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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 4792 bytes
SHA-256: ff14de24b1221d3e4773292c4dd7f8b5234cadd543ec36c55949367cca2848ce
font_01_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 11380 bytes
SHA-256: 83757418993d76b59b4e718fbadf4d999b069cd723f3e0eb35517a5637a23caa

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