Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff232da33ec45a3…

MALICIOUS

PDF

75.6 KB Created: 2021-06-07 11:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da16fb8d942dbcec50af9785590df1c5 SHA-1: c4a07118be6935da2285ea3fb718303664f1da45 SHA-256: fff232da33ec45a36138f7646364479bcf7f72fbc3d369d964a943b2e373fe6d
156 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 of which appear to be SEO-optimized or part of a link farm, suggesting a malicious intent to drive traffic to potentially harmful sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous URLs indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/pbw?utm_term=derek+hull+an+introduction+to+composite+materials+pdf
    • https://cdn-cms.f-static.net/uploads/4403273/normal_602b84a1c6fbe.pdf
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6062eefe69694.pdf
    • https://bakavola.weebly.com/uploads/1/3/4/7/134753875/gepenudowog.pdf
    • https://cdn-cms.f-static.net/uploads/4484612/normal_6029d9b8dcdcc.pdf
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5fdf7896c036d.pdf
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fdfc74f04365.pdf
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/pomigoxikowu.pdf
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/2227ce.pdf
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/aec9db7.pdf
    • https://didaripetog.weebly.com/uploads/1/3/4/6/134685212/xuwevimapi_jujusutefibuki_wugizisux.pdf
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/2980891.pdf
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/f68c345.pdf
    • https://sunatoruxule.weebly.com/uploads/1/3/4/4/134476105/dedekiv.pdf
    • https://static.s123-cdn-static-d.com/uploads/4486374/normal_60b59ee219f2f.pdf
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/mapavodi.pdf
    • https://cdn-cms.f-static.net/uploads/4494146/normal_604a90dfb25d9.pdf
    • https://cdn-cms.f-static.net/uploads/4378405/normal_602bd96d5de6d.pdf
    • https://xixipafo.weebly.com/uploads/1/3/4/7/134745113/9006014.pdf
    • https://limiretila.weebly.com/uploads/1/3/4/4/134465375/427944.pdf
    • https://namoniwuxixipej.weebly.com/uploads/1/3/4/6/134606628/tuneji_rimoxubamisot_kolebolevuxowel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zexowisam.pbworks.com/w/file/fetch/144610287/charlie_malayalam_movie_tamil_dubbed_download_in_moviesda.pdf
    • http://genarozep.pbworks.com/w/file/fetch/144527586/how_to_learn_python_on_freecodecamp.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5e.bin
38ffbb4bf13c1fda8dac068389924f6f7ebb9427cdd3054052ccd43d9bb1de0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 5340 bytes
font_01_sfnt_off0000ef5b.bin
4c535d6a86961cbe26726e30897df26136c19af7dfb447eef908df8e0a6f5498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 10292 bytes
font_02_sfnt_off000112a7.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 4324 bytes

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