Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35eb20f1bf3fda6…

MALICIOUS

PDF

84.6 KB Created: 2021-04-06 01:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 481de505d082de86285ab854dd40a170 SHA-1: 88dbb510537d738c29a4ebf0fd450fe297d2b330 SHA-256: f35eb20f1bf3fda624f061dff572224ec549b7dab9342c4c18ee63670a09bd0d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or link-farming attack pattern, likely intended to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=bernoulli+differential+equations+examples+pdf
    • https://static.s123-cdn-static.com/uploads/4392871/normal_5fe2060007189.pdf
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/c8a6e6.pdf
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/1e6b1dfc5.pdf
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/4071022.pdf
    • http://daisywobzr.rest/dumekupuzabutodokokuiteaw.pdf
    • http://damvglaz1.xyz/tips_for_stopping_bingingmbbwa.pdf
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/torowutalub_sifupewux.pdf
    • https://static.s123-cdn-static.com/uploads/4451574/normal_6003dbee714a8.pdf
    • https://cdn-cms.f-static.net/uploads/4374979/normal_600f1f6e1c2c2.pdf
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/dimaku.pdf
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/zuluzodazon_rodawa.pdf
    • https://cdn-cms.f-static.net/uploads/4482860/normal_600f57d861ae6.pdf
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe3921cd0ad1.pdf
    • https://pipabujul.weebly.com/uploads/1/3/2/6/132680817/nanin-nanevorepelenil.pdf
    • http://hayatevesigar.online/24842852297nf9l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bibejovixapis/70849168940.pdf
    • https://s3.amazonaws.com/nimuwet/96963384236.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_aab667d0fa514ac0b6d125a3078cab9e.pdf?index=true
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_397fa74fb7474d9c85f2478066798541.pdf?index=true
    • https://s3.amazonaws.com/farowug/alaipayuthey_ringtone_starmusiq.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_9a06fee2f0324bd4b2bce0b7d9482ada.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin
81c96dcf3ac641e3868640b309e3f54103405cfbc9b9ce8a270be391d4127807		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 5432 bytes
font_01_sfnt_off000103fd.bin
4bd4e1eadaa9e4b7d7176d4119f16303c8438dcecd4f3fbcf98a186084b47afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 12348 bytes
font_02_sfnt_off00012e9e.bin
714f4e5e8199213a099fe20bc382862ddd143dc6a67614ec22088f3584705904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16252 bytes

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