Malicious PDF — malware analysis report

Static analysis result for SHA-256 839830bb2ba72968…

MALICIOUS

PDF

84.9 KB Created: 2021-03-17 07:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5d543257151a307b93589b139964bc5 SHA-1: be3647e9b6934e5ccf88d9cc5be65e626003ae7f SHA-256: 839830bb2ba72968db7d84f5de2a525d5dce877bbae7ca74b7817b2a47b902a5
186 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 disposable domains, suggesting a link farm or SEO spam operation. ClamAV and ML classifiers identify this PDF as malicious, specifically as a phishing trojan. The embedded links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=dior+forever+skin+glow+1n+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fdfc58e92407.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/cateye_micro_wireless_setting_for_29er.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/romeo_y_julieta_reserve_maduro_robusto.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/old_norse_religion_in_long_term_perspectives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fdb990cb5c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_603410a71b47d.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/is_the_gloss_in_the_irish_times_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_603d2ca7b5419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_60513047555a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60412d6d345cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_604cb9bf84023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_6019034bebd26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fe0ebcdd4b7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421200/normal_5ff50581d1824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_602d7fc01fda2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fe0bc76b28fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_60276a87d9cfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5fe56f1d9e4b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_3c3c686a999b454393ce92826baabab8.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_fa03ed8dd2e04b13aa619a098969dfdc.pdf?index=trueIn PDF document text
    • http://damowepoko.myartsonline.com/2716682202.pdfIn PDF document text
    • http://noratev.myartsonline.com/88926218513.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_f85ad770f42b4bb4b3e871f83b907d46.pdf?index=trueIn 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_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 4992 bytes
SHA-256: 518c8617e54d7acd61114ed111654a2ec1f899315081fdd960eb90adfdbccc07
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 11620 bytes
SHA-256: 827d57d3a01f7d0a7b43f2c209d31df249742b376d8d7716824cf7922c001954