Malicious PDF — malware analysis report

Static analysis result for SHA-256 3724c839a9b3bf16…

MALICIOUS

PDF

85.1 KB Created: 2021-02-28 21:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2c344024fa90779a260b27c832c22f0 SHA-1: 1f6ca031f144f9f05b994608a19ec79e624c4943 SHA-256: 3724c839a9b3bf167011f3d61a54c2912889d85bab53dbc99a25df9a5d19c159
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly domains, suggesting a link farm or content distribution network. The primary URL, 'https://dafemum.ru/strik?utm_term=ncaa+division+2+conferences+map', is presented as a map of NCAA division 2 conferences, a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=ncaa+division+2+conferences+map
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/1f1b5750.pdf
    • https://vadekelovade.weebly.com/uploads/1/3/4/3/134372386/gijot-jokirered.pdf
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/sibetizafenorubomi.pdf
    • https://kupalupatumer.weebly.com/uploads/1/3/1/8/131857031/f8ee0fd0f4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetubakuz/wotojadababigunelepado.pdf
    • https://s3.amazonaws.com/geraromu/private_instagram_stories_app.pdf
    • https://s3.amazonaws.com/tinivukedeta/40998728693.pdf
    • https://s3.amazonaws.com/zuguvoxoki/dadibad.pdf
    • https://s3.amazonaws.com/fodose/warhammer_40k_rulebook_9th_edition.pdf
    • https://s3.amazonaws.com/mejigavukolu/zazeduziruzajagizin.pdf
    • https://s3.amazonaws.com/gozilum/approval_letter.pdf
    • https://s3.amazonaws.com/widuxade/prelude_in_b_minor_chopin_sheet_music.pdf
    • https://s3.amazonaws.com/bejexe/98217758987.pdf
    • https://s3.amazonaws.com/senodiw/dojutipujibado.pdf
    • https://s3.amazonaws.com/gapivegek/45649935376.pdf
    • https://s3.amazonaws.com/bexolamabad/yakuza_5_ps3_trophy_guide.pdf
    • https://s3.amazonaws.com/vuforewebub/button_loading_android_studio.pdf
    • https://s3.amazonaws.com/juzewojavomofew/muzotemaba.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_off0000f47b.bin
456946ad12271cb7b287ed90dcc2764fa9693b0d29ad921cc016d0722130f0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 4720 bytes
font_01_sfnt_off00010504.bin
a50d7282016822dce34d88361b8d24d9bfc7715c30a5c8ffbff6788cd243d548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 5432 bytes
font_02_sfnt_off00011779.bin
ee334e504d6e822bdd8a3f8130caf8a8130ed25a83c4cb4028713777becb1f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 15196 bytes

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