Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92e8e6dfa43ff46…

MALICIOUS

PDF

85.9 KB Created: 2021-04-02 09:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39cd88e2520c1ddb595d96505895a9e9 SHA-1: 76d1c01b9f6e9059a254cf4f3954e770b8a71c2d SHA-256: b92e8e6dfa43ff465c26d4d79ed9bce43251cb10018cbdd5e92c4977a9518d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, indicating a link farm or phishing lure. The PDF_SEO_LINK_FARM heuristic specifically flags the presence of many external links, suggesting an attempt to direct users to potentially harmful websites. The embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/123?utm_term=translation+peptide+bond+formation
    • https://cdn-cms.f-static.net/uploads/4477409/normal_600c70ca5b723.pdf
    • https://cdn.sqhk.co/gokarunedod/qDhfVhe/34802918546.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/51dac8fab1.pdf
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fcdcec5d4915.pdf
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/b395900ec.pdf
    • http://nosilekexiwot.mywebcommunity.org/2649274786.pdf
    • https://cdn.sqhk.co/jowoluguwoge/eibmjeA/zombie_invasion_gif_wallpaper.pdf
    • https://cdn-cms.f-static.net/uploads/4486215/normal_6056f90f81fac.pdf
    • https://cdn.sqhk.co/fuvebopeweb/fijgi0c/asphalt_nitro_apkpure.pdf
    • https://cdn.sqhk.co/kasuwune/aggwQje/the_kominsky_method_season_2_episode_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4451376/normal_6041239a3c822.pdf
    • https://cdn-cms.f-static.net/uploads/4450634/normal_6028f57f1e7ca.pdf
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/fapejanuragopavir.pdf
    • http://ruluzuzadol.mypressonline.com/40191463549.pdf
    • https://lifunakejeka.weebly.com/uploads/1/3/4/3/134358873/1355695.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602a82531b6c6.pdf
    • https://cdn-cms.f-static.net/uploads/4464532/normal_60100333798a7.pdf
    • https://cdn.sqhk.co/javajadoj/FDjhgiS/attack_on_titan_fanfiction_eren_hated.pdf
    • https://cdn-cms.f-static.net/uploads/4448337/normal_601b6f2068765.pdf
    • https://cdn.sqhk.co/xerejijasoma/c3jckjh/tonifubaxeribelexu.pdf
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601094fbaa58d.pdf
    • https://cdn.sqhk.co/keropolor/eaKAShj/58773223520.pdf
    • https://cdn.sqhk.co/sarowojep/Youuaij/57166686954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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_off000107df.bin
8c1e48eed700a84e640857e468c1119a186de15e6c95d733a4b89071d6d55175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5064 bytes
font_01_sfnt_off000118eb.bin
7242a5fcdf366872ba7ec336be397c512886972f4eb06a85c778e85e36078489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 10192 bytes
font_02_sfnt_off00013bd3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 4324 bytes

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