Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fc71b2d3134ded…

MALICIOUS

PDF

78.2 KB Created: 2021-03-12 17:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 29361935763fb6235e1236edf5ce4e4e SHA-1: 1a75a5082e1bc84e775ea06a79b30c388975e299 SHA-256: a2fc71b2d3134dedbad52efd948ea83af369b82882bf3c29408af16b38fdc875
186 Risk Score

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 0.9992

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://fokemale.ru/123?utm_term=tamil+album+songs+video++hdvidz PDF link annotation
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/3423284.pdfIn PDF document text
    • https://xalitive.weebly.com/uploads/1/3/4/3/134320973/vivepisewife.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/tajuvanawutas.pdfIn PDF document text
    • https://besixovit.weebly.com/uploads/1/3/5/9/135997460/pemomemonum.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/widib.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/90631038a16.pdfIn PDF document text
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/1667642.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/safev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/31924500494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0b1d84-bcf2-48fb-95cd-26739f97fffe/element_tv_sound_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66f5899-bad9-47d6-a232-e8bc369903a8/41362540419.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_a338e3c88d1f4d0da1579c5567215a6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75dfba8f-f50a-47bc-b2e7-f96cc0236795/alcatel_pixi_4_tablet_specs.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_582f4486d66a4f79aa2059d160f13bfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/wuginesewome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d63d74-00bc-465b-8061-1c42f98bb3b2/unwind_neal_shusterman_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/reported_cases_of_zika_in_fiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa11143-fb2d-46f9-8d88-fb7f92f44cbd/fluke_microscanner2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f654de0-3e1f-4971-9960-71d980d39b67/16316578414.pdfIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_710ce3f812d047b4a40630b5021f6ea3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff7989c-e572-472e-933c-dfe48268a20f/pifamewezanunedaxagorepot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea67294-9883-4d55-8999-5f7d1775c3c6/86205179181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8c5a04-23ad-4ed8-bb16-51f0f8334e8f/a_little_life_book_online_free.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_39ae9b7d69c248dab0cc5319ec7ed75d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5344 bytes
SHA-256: 85ba94f3cacb75849e4f11e394abd9cd112ad23669c4ed9a90b59215269e53f8
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11016 bytes
SHA-256: 860dbf8cbb0f749fcdfb531fc6c020a877d85f0f3a92085359d80c624ecd7e2e