Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5b35692faaf25e…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 03:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: babb6a391ea0a508404f280a8f0852a6 SHA-1: b0201948665343ae023036ac54b63b1681ea50c1 SHA-256: 0a5b35692faaf25e4eacfd9d9f9cb5093fe8e97f3c90d2804796f3cf24435dd3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/wix?keyword=kumon+books+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380086/normal_5fcd2596b0605.pdfIn PDF document text
    • http://vizionsmc.net/puzzle_page_answers_crossword_july_194smo9.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/carcassonne_star_wars_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_6040be1e5788f.pdfIn PDF document text
    • http://raisinshub.club/what_would_cause_a_front_load_washer_not_to_spinyf5o2.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/hhthdQr/tap_medical_abbreviation_urology.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/tiny_homes_plans_canada.pdfIn PDF document text
    • http://strahauto.website/fluval_306_canister_filter_mediaac1mv.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/hh3VPTZ/fun_facts_about_spain_s_flag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451927/normal_5fcba57e1c31d.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/guduvebadigububgou3z.pdfIn PDF document text
    • http://pifanaliriwabo.mygamesonline.org/canavalia_brasiliensis.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/cjgicfL/34527824631.pdfIn PDF document text
    • http://detonicro.website/telcordia_sr_332d59wk.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/hgdjahj/zoxukunonof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_3608183f8bd448078ce2a8a37dcdbbf8.pdf?index=trueIn PDF document text
    • http://wupidusujimi.myartsonline.com/turebipetunitilofepomur.pdfIn PDF document text
    • http://seguwogira.rf.gd/actiontec_mi424wr_rev_e_firmware_download.pdfIn PDF document text
    • http://latananuv.epizy.com/59653198759.pdfIn PDF document text
    • http://lufeneweb.epizy.com/seresofezibozufiti.pdfIn PDF document text
    • http://fokafupu.rf.gd/dstv_explora_installation_guide.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_e9416f7abf7c4993ba3859398b393c19.pdf?index=trueIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_e245e8da8cd442b8a513c8c852d4a122.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 4872 bytes
SHA-256: a0d5dda05347527458bd35128e2b238adf21842e518a6625cc7510e10020ac61
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 10952 bytes
SHA-256: ab18a5cb4e177cfdadb6eab3ac49d11c27108c795d7acd8db70084396eac7ab4
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f