Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b61dbf61a932574…

MALICIOUS

PDF

81.4 KB Created: 2021-03-06 10:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2eadb0142551306ecb5ea4c9fd8de5f SHA-1: edc638f938d7f8b9f6621b8402fee9d1cf342e7d SHA-256: 3b61dbf61a9325740b60921f1c768f9c611bab8f61d7372230a266890e6e15d1
166 Risk Score

Malware Insights

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

The PDF contains multiple links to disposable domains, and the ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'how to control ocd compulsions' which is likely a pretext to encourage clicking on embedded URLs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_PASSWORD_ARCHIVE_LURE heuristics further supports a phishing or malware distribution scheme.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=how+to+control+ocd+compulsions PDF link annotation
    • http://sandiego-podcasts.com/afterlight_mod_apk_latest9nyj4.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/sanekopunojavifuko.pdfIn PDF document text
    • http://fruits-summer.fun/zabaranenobivemobefudiy71.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/how_do_i_reset_the_wifi_on_my_echo_dot.pdfIn PDF document text
    • http://bnl-jobs.com/76820807940hvky1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5ff077b3c84cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe6db9615efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_6042201b168b0.pdfIn PDF document text
    • http://blekrossi.ru/pencil_drawings_of_flowers_and_heartsu7t7n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_603930a845d64.pdfIn PDF document text
    • http://all-casino.xyz/92169818791yr1wa.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/goziwezaxotiduzavit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fd748ab17691.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/horus_rising_audiobook_free_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_6025ce2c356dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_6037dab2e0668.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/que_es_una_propuesta_de_valor_empresarial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fezenur/catharanthus_roseus_plant_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/goodview_mn_police_reports.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_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 5064 bytes
SHA-256: 1070f28bc51bf09d1b3f1dd39e96586da2e69a9d5b7b36a019c84a6b9217c0cb
font_01_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10636 bytes
SHA-256: 53a1c2f5bd0296506c397cc04a014ef969ddb20e21249f829aef2ccda6952032

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