Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ac2c09e388a7bd…

MALICIOUS

PDF

79.3 KB Created: 2021-04-11 14:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2e20cf49d07cd0b116ba482e38e0c9c4 SHA-1: 22b86480805d9c91164aa81bce6b323bf2f4c097 SHA-256: 40ac2c09e388a7bdc3d4e0673e13bb099e8a9b32485374ceb709c3d0d6c96720
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous embedded URLs leading to external sites, some of which are hosted on disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=stamina+body+trac+glider+instructions PDF link annotation
    • http://avtovishki-msk.ru/gireng6l1a.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/gflYU3e/59053130626.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/renafu.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/tough_mudder_training_programmesht4b.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/fidizidojutumizesejese.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/ojiijgh/gawapiximupawo.pdfIn PDF document text
    • https://sudikefasegez.weebly.com/uploads/1/3/1/0/131070357/muzelojekefosajil.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/75678938912.pdfIn PDF document text
    • http://guitar.su/2998454523do3ze.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/sozelefaxofikes.pdfIn PDF document text
    • https://xuzubakew.weebly.com/uploads/1/3/0/9/130969304/liwapuzidebiguwa.pdfIn PDF document text
    • http://novoruxove.iblogger.org/92198181904.pdfIn PDF document text
    • http://maska-respirator.com/zomugaxiradapegofugexa5jfnv.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/Mfgcuge/19941825836.pdfIn PDF document text
    • http://dom-bita.org/how_to_change_battery_in_womens_timex_watchlqsxs.pdfIn PDF document text
    • http://topuniversityru.fun/economics_for_dummies_free0avr8.pdfIn PDF document text
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/bifewib_didobim.pdfIn PDF document text
    • http://luminar2-download.xyz/why_is_my_lg_remote_control_not_workingpb2al.pdfIn PDF document text
    • http://bigno.space/what_do_social_justice_meanqdruu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusavubifitivik.rf.gd/android_animatorset_repeat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 5604 bytes
SHA-256: e92a32875dff41ceaf9b380e6d24196a09781e3d36bf38035d3f2a257f3f3bb2
font_01_sfnt_off00010a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A21 11104 bytes
SHA-256: a718378e5f3ae0173570b15507173623a7a730916713c97e228b225d11088cd1

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