Malicious PDF — malware analysis report

Static analysis result for SHA-256 babfb727607d5b83…

MALICIOUS

PDF

76.1 KB Created: 2021-05-22 02:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6d94b78abfa9591aa220fa574c3ab11e SHA-1: 987f9868c414b12895821ede0f6ad0df6506db22 SHA-256: babfb727607d5b832ce91f7a67c4ce30bbb914cf66ca393aad0dcd8242e60538
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 operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of redirecting URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

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://zajinet.ru/strik?utm_term=aws+certified+solutions+architect+sample+questions+answers PDF link annotation
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/707660.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/6865e984ab.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/bevafugune.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/5371915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_602fcc40cc364.pdfIn PDF document text
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/xoxebuxifex-suzobot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382778/normal_5ff64d7ca5655.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/473352.pdfIn PDF document text
    • https://xexijawabipej.weebly.com/uploads/1/3/4/3/134317257/nuwogukipamaxev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5ff3d32996755.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/takuvidub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6059fb38a25fb.pdfIn PDF document text
    • https://futuratolofuzup.weebly.com/uploads/1/3/5/3/135399438/vexad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_60438536c3a26.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/8560940.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/gijepomox.pdfIn PDF document text
    • https://fotaluxig.weebly.com/uploads/1/3/5/9/135973299/6655565.pdfIn PDF document text
    • https://gatixitawenubik.weebly.com/uploads/1/3/4/6/134643062/piduzunetofofa_viwemi_fasuto_nusojokumezaxix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_6056442a900b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60619b638b1a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5fc5bb19c12ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5604 bytes
SHA-256: 57ff20c10ce4d4e0b5da31b40a306c605c04e78dedcbe63ab2a899d8ab41584b
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 11496 bytes
SHA-256: 1c0ee5913019f905126b3f9e05f41206c08b5c078a789acc37f98c896f23c821