Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4aff7a497f9b7d1…

MALICIOUS

PDF

77.3 KB Created: 2021-05-01 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f1b4d2b0fe33f83cdde71b6573c24e49 SHA-1: 721796ad375bfbb9b405a4eefb9279188ecbbea5 SHA-256: e4aff7a497f9b7d1a7504ed382b871020ec18dc44495c7995ae1af809003d0b2
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=how+to+upload+dna+results+to+gedmatch PDF link annotation
    • http://uorott.com/how_to_reference_a_cell_in_excel_vba8g3ic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fc890b94a7bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fdf64eaef154.pdfIn PDF document text
    • http://pe50off.info/rebazularinijzbzeu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_60320e69ce022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_6057f5bfd6ea2.pdfIn PDF document text
    • http://pushbiz.fun/momedejuguridapz5gie.pdfIn PDF document text
    • http://antileqphh.site/mubetenupobusmkhqa.pdfIn PDF document text
    • http://ifeelgood.club/macbeth_act_4_quotationsczrr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6012785333f75.pdfIn PDF document text
    • http://dostafood.xyz/world_war_z_scriptkfbhy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5ff29fe0a421e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fe905a6d5f70.pdfIn PDF document text
    • http://thelandofbadideas.com/criminal_lawyer_brampton_free_consultationt2ykh.pdfIn PDF document text
    • http://pedrons.space/epilogue_la_la_land_sheet_musicf55w2.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/5b8e8516-b756-4c9c-8b55-76078854c13f/what_is_the_importance_of_choosing_relevant_literature_in_writing_a_research_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf05ba4-4e63-4127-a095-c220570a6179/teledo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03b9c93-bf4e-4bc3-a2cf-c47086105be0/95177627419.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_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 5540 bytes
SHA-256: fc5b8540cff7a006820313970380f0622e99adf9d36332ca73d601feb84169ae
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 11224 bytes
SHA-256: 49ab36e0d3bdd05961fa27fbdad3c30a684eb47d4a00840a2687d723f53fddeb