Malicious PDF — malware analysis report

Static analysis result for SHA-256 179dcaee1c6a4bcd…

MALICIOUS

PDF

90.9 KB Created: 2021-06-11 08:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9c40fec94aa94ebb8617017da3cb50 SHA-1: dd919e338a3ba644bdd731c9664ee41468fdadda SHA-256: 179dcaee1c6a4bcdace7f81a0b177a8c3bdd728e99293be45d6d61cda73544ec
164 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 pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic for a "PDF_SEO_LINK_FARM" indicate the document is designed to funnel users to external resources, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/pbw?utm_term=tamilrockers+2016+hollywood+movies
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/zojekoputal.pdf
    • https://balemimuw.weebly.com/uploads/1/3/4/8/134882120/059f47c746782.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/330e9.pdf
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5fc95e6b3f2eb.pdf
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/nofoxoboxesonep_renubugoxasaf.pdf
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6038c05b30807.pdf
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5ff619016febd.pdf
    • https://xuvamedinomu.weebly.com/uploads/1/3/5/3/135392700/0a0943.pdf
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5ffd780254cfd.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_605704fcc975c.pdf
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/b6a32088.pdf
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/8dd14b.pdf
    • https://papozigej.weebly.com/uploads/1/3/1/8/131858530/jajukazo_bezod.pdf
    • https://cdn-cms.f-static.net/uploads/4369629/normal_6024425c7d196.pdf
    • https://cdn-cms.f-static.net/uploads/4374196/normal_6038937ae5e9d.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_60292fe2bfd67.pdf
    • https://wuporebepumi.weebly.com/uploads/1/3/5/9/135981990/732226.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6042db911e08f.pdf
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/4266745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011793.bin
6ddcc398a5a9988e4b6abec1abf4d0ce9b5c4582a5d5d3475241cb4b653f8628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 3176 bytes
font_01_sfnt_off000122db.bin
19eb03b006937eef734a24e3dcdee778d12c7172f2e3c76920f9c7deb778403c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 5928 bytes
font_02_sfnt_off000136fc.bin
959a55a210b7d8e51d9e49d0f14eee428b13f292d8b1b2747a03e317c3b43135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 11692 bytes

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