Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f6720dd3befc9…

MALICIOUS

PDF

84.7 KB Created: 2021-05-25 04:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6efa777b31bba433cd55737ef84c24b0 SHA-1: 424f42ef4526b0416e02586ea7f34caf8ba857bb SHA-256: 283f6720dd3befc95282cb42d61376de6d7dbf4c0e6b91d88f7530c34a7eebd7
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to search terms for game hacks, suggesting a lure to trick users into downloading or visiting compromised content.

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-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://bologen.ru/strik?utm_term=geometry+dash+apk+hack+todo+desbloqueado+pc
    • https://cdn-cms.f-static.net/uploads/4471095/normal_60502e1158d20.pdf
    • https://cdn-cms.f-static.net/uploads/4375517/normal_600e21458585b.pdf
    • https://rugitaroginuwim.weebly.com/uploads/1/3/4/7/134768051/xumutagovero.pdf
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/bipadezaxujej-gowilo.pdf
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/loguwaleku_bigigone_sadipurumujipoj_wetazis.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_600b1d57ec7c5.pdf
    • https://nasaxedinevizuv.weebly.com/uploads/1/3/4/7/134759800/najedub-wuzufebidoz-rifuremo.pdf
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/5566211.pdf
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fcd6cb4162d4.pdf
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/semujixi_wuxaritodik_bexabiwalegefe_reserew.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd3c4787d745.pdf
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/0326e8aa2b493.pdf
    • https://cdn-cms.f-static.net/uploads/4459166/normal_6015c277e89e4.pdf
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/5205624.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zategafozasiru/mekevipatid.pdf
    • https://s3.amazonaws.com/welanisowari/viper_remote_start_installation_cost.pdf
    • https://s3.amazonaws.com/fezenur/79547917010.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/imf_iran_report_2018.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_off0000fc44.bin
b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 2880 bytes
font_01_sfnt_off00010682.bin
3186668cc7c6d401545ffdf5cf011020eec2a9d49ab4d56ac4e83dda54c0314a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 5776 bytes
font_02_sfnt_off000119fc.bin
4b4c4e8a154f71c3f7d22ccda2663a576982f7832f3c5768cf12b0f448ebd509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 13620 bytes

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