Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c215caad49ae97f…

MALICIOUS

PDF

78.8 KB Created: 2021-04-16 20:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 808e2f77fbde10858c77e2cda3dc579d SHA-1: ad6774172cb9a2b1ee743d91a58cbc6ceba53ae4 SHA-256: 8c215caad49ae97fab5959b1f9d2330189565bff9a2c880d91f4f646385563ae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM". The primary URL, zajinet.ru, is associated with a search query for "Toyota stereo wiring diagram color codes", suggesting a lure to a phishing or malware site. ClamAV also detected this as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to malicious content.

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-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://zajinet.ru/strik?utm_term=toyota+stereo+wiring+diagram+color+codes
    • http://dontbeshy.xyz/how_to_qualify_for_reduced_fare_metrocard8snah.pdf
    • http://storeeu.info/famutepeluwevenofepiqcx4.pdf
    • https://cdn-cms.f-static.net/uploads/4476593/normal_604e2c38cfebd.pdf
    • https://cdn-cms.f-static.net/uploads/4379844/normal_60219bb4c509a.pdf
    • https://cdn-cms.f-static.net/uploads/4405945/normal_603d57b36887b.pdf
    • https://cdn-cms.f-static.net/uploads/4423166/normal_603e279bac37e.pdf
    • https://static.s123-cdn-static.com/uploads/4465389/normal_5fffa2701d9e2.pdf
    • https://cdn-cms.f-static.net/uploads/4480408/normal_605a0f179639a.pdf
    • https://cdn-cms.f-static.net/uploads/4527108/normal_604ac805c9031.pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_6022534e35e7c.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fea0b049da6e.pdf
    • https://pavufunipuz.weebly.com/uploads/1/3/4/2/134265556/7451567.pdf
    • http://1xbets-reg.site/annotation_toolsxrnsu.pdf
    • https://budogifu.weebly.com/uploads/1/3/0/8/130874026/5102403.pdf
    • http://graatorama.fun/genel_iletme_kitabba7y4.pdf
    • https://cdn-cms.f-static.net/uploads/4482629/normal_60669d58e128f.pdf
    • https://wigazasadus.weebly.com/uploads/1/3/5/9/135974004/fobiwoteferebawew.pdf
    • http://milanomoda.site/xevonamisevobilifutu92cwx.pdf
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5feb4cedbe1d1.pdf
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcb5bc3c7f8c.pdf
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fd2252f56aee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_8e91797e69db41d897396c16580524ce.pdf?index=true
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3adcc584ee754644932f4560f25eb369.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea99.bin
480ec690450665e5620d38ddd718f37b3ca7c1bf988174277245bb797900dc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 5192 bytes
font_01_sfnt_off0000fc37.bin
a99b688308aa10a2d12f821ab99dbca1f17e2ea77cad5e0c262ef0b2b288c223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 10460 bytes
font_02_sfnt_off00011f78.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 4324 bytes

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