Malicious PDF — malware analysis report

Static analysis result for SHA-256 e977e0deaeecf04b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 22:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 245bfade51f449d1d19a740d86d1801c SHA-1: 6c4f707f3764eb35b5b757d3c14e9a048db44a0b SHA-256: e977e0deaeecf04be6b19d55952ccf13f8f0db1c4ed94735f3673b3fdd300b1b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://golowaki.ru/award?keyword=capital+market+pdf+calicut+university PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd3cc1752bae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5feeb38387db9.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/vufolalopafexaxox.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/wNa7jhe/video_editor_salary_us.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/ijhfggp/cash_app_says_debit_card_not_supported.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/3132338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_60463ce287521.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/7d8ba3a496f642.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/diboguwuboli.pdfIn PDF document text
    • https://ziripovamenof.weebly.com/uploads/1/3/4/6/134647136/9c7995110066.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/bahcheY/55749889230.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/8075005.pdfIn PDF document text
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/b8471c.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/c6tOjeF/vebeduxe.pdfIn PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/lonofew-goguf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_7a68751f1cc2491eba6e15e04212f538.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_2aad3a1372a1412c9941d418fc882fc6.pdf?index=trueIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_5a2356f1531949c9b55455fe79e3c3cb.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_d8b357ade8064ae097311c9d9034ba9e.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_603c46e349164c33a48790b510b0b6df.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_2810f3753eea4965a4919489d041e333.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_39c5f1dfdd884b07bf266ec7c5db8cd3.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_ad5556346a07470fa479f76a88d01742.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_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 5432 bytes
SHA-256: a66758c3cebac3b5e30edd8907665a98e257f7821be1e58e80fb7a071e4d61b8
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10296 bytes
SHA-256: cdaf0bcb938b9118d2a563bbe37c309c556e5dbfa1f66d130a864e5e0d1ef136