Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1969965c0b0f35…

MALICIOUS

PDF

69.8 KB Created: 2021-02-11 20:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e96a1550d1698f8e60d5566f1aeef32 SHA-1: 42638336b15063233ac23fca6370aef65e671c7c SHA-256: 6b1969965c0b0f357c08ea970454d24f56d3b7f241a5360a4b72327cbc7c4ed0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a large number of external links, many pointing to Weebly-hosted PDFs, suggests a link farm or redirection scheme. The document body, though corrupted, contains references to 'Verizon yealink t41s phone manual' and 'wkhtmltopdf', indicating a lure to disguise malicious links. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jacksth.ru/123?utm_term=verizon+yealink+t41s+phone+manual
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/450007.pdf
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fceff1f9c5e3.pdf
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/3895162.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5fe9da99505ef.pdf
    • https://fitinunajixir.weebly.com/uploads/1/3/1/6/131637477/tetemowuter.pdf
    • https://fezipogapatud.weebly.com/uploads/1/3/4/8/134888370/9750347.pdf
    • https://fupodakabapamom.weebly.com/uploads/1/3/4/4/134489617/6676427.pdf
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/a1b63e92eaca7.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/8184382.pdf
    • https://static.s123-cdn-static.com/uploads/4426277/normal_5fca7e1721023.pdf
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/bf9d9b12.pdf
    • https://static.s123-cdn-static.com/uploads/4412165/normal_5fcb20ea3c11d.pdf
    • http://mon-cmb.best/468491298081f49a.pdf
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/mepakamesurab.pdf
    • https://notozovurex.weebly.com/uploads/1/3/2/8/132814393/1609d9347.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumasun/free_niv_study_bible_apk.pdf
    • https://s3.amazonaws.com/jeworurowam/komudobodojogukaguso.pdf
    • https://s3.amazonaws.com/gezetega/acknowledgement_for_ojt_narrative_report.pdf
    • https://s3.amazonaws.com/xakapudakadu/57329987391.pdf
    • https://s3.amazonaws.com/fewifuwu/19522649988.pdf
    • https://s3.amazonaws.com/sazariwapa/wotogekolajizubotuz.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a7.bin
a4b6202ab3617756b30ec3c6f5bd2f4119823f5dfec53290237c17de564f552d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 5380 bytes
font_01_sfnt_off0000e5e4.bin
3e1d4211d2817e5791e442c2d9863e9d5ae5bb733ee596662012fef5efb527b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10528 bytes

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