Malicious PDF — malware analysis report

Static analysis result for SHA-256 b780feb2b2c0a86e…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 22:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c333b9b746c365a5da858d746a35e2d5 SHA-1: 1517bdf4b2beb0b073080d5669c629f58c078764 SHA-256: b780feb2b2c0a86e5e890010acc128a803ebe8eb05acecc5f0330141ad8e992a
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 0.9998

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://xajibur.ru/123?utm_term=ajax++file+mvc+c%2523 PDF link annotation
    • https://jikufowawuful.weebly.com/uploads/1/3/2/8/132814232/larer_kujita_wigetove_todonovuxowipe.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/5ed7c0.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/rutezevol_difegorowuz_pumigesafanedu_rarijoruxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/ejgnjjq/rushmorelm_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/DhgjSih/exodus_20_16.pdfIn PDF document text
    • http://car-den.ru/what_size_file_to_sharpen_stihl_ms2714cosc.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/6sjjgtp/masugipevubelojimur.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/pajupukiwuparabij.pdfIn PDF document text
    • http://migriruy.ru/gillian_chung_alexa_chungneewq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_7e48f0d7f1a04c02a4ed7e1fef94cbf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/588ce062-e3e6-4086-9ff3-49fb2e095fe9/46470685544.pdfIn PDF document text
    • http://titizobilane.epizy.com/62575883849.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_56ff05c6fb2e4c91936a1c6a74353511.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b3ce81-37a6-4839-95cf-1e48f54acc41/nagebofexemuzof.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_f6d9570ccb7b497492eefd84b7d2315c.pdf?index=trueIn PDF document text
    • http://dojopugoput.epizy.com/tojevomijefabagaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f6656d-ba8c-4c53-8e9b-894a22c89d7d/what_is_management_information_systems_careers.pdfIn PDF document text
    • http://nipufafinera.epizy.com/al_quran_with_bangla_pronunciation.pdfIn PDF document text
    • http://kujazidi.epizy.com/posumuwubupobid.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 4948 bytes
SHA-256: c807fa5d370d92575c04f0798f351bda5310f5fb79c33ebb6d8ef31ebe6d66c4
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 11796 bytes
SHA-256: 6af6f1dc1471a3e25f904289048c99cab38218385f5802da145c5d586dab63cf

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