Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5fa84897784bae…

MALICIOUS

PDF

77.7 KB Created: 2021-05-16 07:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: da251310274ae1a039000a255f8dd872 SHA-1: 11e44ba70e6089c5aaee9282838c617bff1995d6 SHA-256: ba5fa84897784bae4567211fad551af14777fe786de089aff21ea6e529347c21
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for distributing malicious content or phishing. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 http://fadekitexef.iblogger.org/robonik_biochemistry_analyzer.pdf In PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/runovigonene_doduf.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/kaximigekosivatugo.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/cb10e.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/adobe_pro_mac_download.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/10f1981f.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/26717892203.pdfIn PDF document text
    • https://beveroseve.weebly.com/uploads/1/3/5/3/135316004/1cb87b1ba9d.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/a634593b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=how%20to%20tie%20loop%20knot%20for%20braceletsPDF link annotation
    • https://uploads.strikinglycdn.com/files/6ac791ef-acdf-4203-b38f-f5b791fd3870/jesus_storybook_bible_christmas_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd88ee63-ef26-411b-b4ba-0adb7f48689a/how_to_use_lowrance_hook_5_hdi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27582a6a-834d-4473-81ec-6d1de3dfcfda/puzigoduxedar.pdfIn PDF document text
    • http://zijodere.rf.gd/gajonikipijunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dc7c4c-7c64-4e3c-b9bd-519e0fb9b2da/91981769583.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_810f2985e9544d3784c8c755866aa115.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_82a482ecdfdc46a284c51872fc0ec54b.pdf?index=trueIn PDF document text
    • http://guxozuzemonixe.epizy.com/blockchain_applications_in_supply_chain.pdfIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_d13587ed5d8e4fd78c142acc0c94137d.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_25a16ebe65e14ae18e7c0bc79449642a.pdf?index=trueIn PDF document text
    • http://likitaponuviv.rf.gd/campbell_biology_11th_edition_reddit.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_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5268 bytes
SHA-256: e93ef0ce5b61dec7c0aed7ad31c70289025f796200ec6ee682be298e4e146a12
font_01_sfnt_off000104b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 10832 bytes
SHA-256: 95b1e93f1d2c8ef4e0c0e7818356ce662b338b71c3a5ce895664f645d821ed8f