Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7520380450a9017…

MALICIOUS

PDF

112.6 KB Created: 2021-03-07 19:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 444f5f9001299fcc475344fe09e6cc9a SHA-1: c54ac796f98bedf1fbf5b27df29169843e8163ea SHA-256: b7520380450a901724aaa199f37e9c02bfb9cf4396f024dd6a6f4124d6b55513
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded URLs point to various disposable domains and hosting services, further supporting the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=instant+keto+boost+reviews PDF link annotation
    • https://cdn.sqhk.co/zevolazezag/JNK5ggx/mcc_pilot_log_vs_logten_pro.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/sofebikikamamuj.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/ifgdgd7/18859573125.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/f2ifidV/baby_gap_snowsuit_size_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/fEhihjO/62295753523.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/how_do_you_calculate_energy_dissipated.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/gcZhpjh/eric_church_song_jenny_lyrics.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/8473230.pdfIn PDF document text
    • http://lufexaxoxak.mygamesonline.org/conversion_of_fe3_to_fe2.pdfIn PDF document text
    • https://zosumomaxin.weebly.com/uploads/1/3/4/0/134040430/ziwava-temasodofofaw-nevezizixi-vofatogipageve.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/ijhdH1h/mibijisosofepifenirifi.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/optimate_4_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/a7Uiihc/29231293544.pdfIn PDF document text
    • https://cdn.sqhk.co/pujalabasi/jigcNhd/64507583824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://valupakukav.myartsonline.com/93317954916.pdfIn PDF document text
    • http://nununad.myartsonline.com/garejexesikenumodexawa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17028 4728 bytes
SHA-256: bba75b8782b530f3a9ad4bf39ca356d74eb5882f9cb2431cfd747ca26c9a0b24
font_01_sfnt_off0001804d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1804D 11404 bytes
SHA-256: 7825c2f6c2ffd8dfb1824b1cd6516685ce5a36ffd0d52646b3d3e21ff75dc8f7
font_02_sfnt_off0001a729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A729 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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