Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b1a058099226d8…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 00:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd37056c7f047aad224d0e6f53732ba5 SHA-1: d5c64efea3dead10a3a7c18a6ede36d4ffbd62cb SHA-256: 43b1a058099226d8305a13cf3a2e781fbfcb18cf18935678fc54cf4d5ab93e94
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://zajinet.ru/strik?utm_term=avengers+endgame+release+date+blu+ray PDF link annotation
    • http://vezerfa.xyz/71222174712zyeaq.pdfIn PDF document text
    • http://astropsychology.site/the_lovesong_of_j_alfred_prufrock_summaryjm8f8.pdfIn PDF document text
    • http://winwites.space/national_geographic_subscription_loginu4gd3.pdfIn PDF document text
    • https://jamolirotiwe.weebly.com/uploads/1/3/4/6/134693152/71159bd4.pdfIn PDF document text
    • http://tcerkovniekupola.space/rovanukepeketepipasmn8cp.pdfIn PDF document text
    • http://thiswaytovogue.com/magnus_chase_and_the_sword_of_summer_summarymq4mk.pdfIn PDF document text
    • http://bigpleasure.ru/sagasakexebifax6kgra.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/ae7c9.pdfIn PDF document text
    • http://vipogomer.iblogger.org/repair_appliance_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f97290-f02e-4dde-8efd-efe84541fba6/rotudozisuwexizasezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9751fb2-9b52-4193-9716-756c0ff11ff5/gusokibedazepumekamomudob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8481a905-7519-4b3c-bec4-c397fb05067c/78050330906.pdfIn PDF document text
    • http://tanozetodane.rf.gd/wivosopovun.pdfIn PDF document text
    • http://sufekowanak.rf.gd/psychiatric_nursing_assessment_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdffadf-d615-4e14-a934-0e072a01756a/birds_and_the_bees_lyrics_idk.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/16788763067.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_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 5436 bytes
SHA-256: 7f0802b996fd136bcab08c544f44202c91a4f8fc615f0ae9ca73edb558bac532
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 11428 bytes
SHA-256: 6e96e6a8ba9f125dd9371f6a0eff454dc6a67364affe2591de69a1feb892c757

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