Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8704fc52061dd7e…

MALICIOUS

PDF

124.6 KB Created: 2021-02-23 23:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7120a486d9988d7d08c7c0f5288ec9a2 SHA-1: 851e754827e8f5b4351dd920e4cc59fe137d952f SHA-256: b8704fc52061dd7e129f63b0fffb09779b7f7fd6ad205da9e8fc9ca81d863915
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable hosting and redirectors, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=how+to+enter+data+in+a+pdf+file PDF link annotation
    • https://cdn.sqhk.co/kujufemom/hgjeMii/18334970096.pdfIn PDF document text
    • http://legejuwarowu.22web.org/80578934645.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe077f504821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_60065a08f16ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_603046881ee5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_602265b87043f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_60349793aeca0.pdfIn PDF document text
    • https://cdn.sqhk.co/faxixuwako/hh7pidp/pobolixinunelegomeno.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Pgjfjip/dan_the_dungeon_digger_trap_adventure_2.pdfIn PDF document text
    • http://winsbig.space/wewefikcn09n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fcbc9468eafd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fd2d00035c93.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/how_to_make_ratios_into_fractions0v1id.pdfIn PDF document text
    • http://lightstart.xyz/how_many_quarts_of_oil_does_a_toyota_corolla_take2dora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fc9ec153ccb1.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
    • http://vadibezodaxilez.rf.gd/68267160051.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/ms_office_for_mac_2016.pdfIn PDF document text
    • http://zaxalamel.rf.gd/riwudiwawusegar.pdfIn PDF document text
    • http://givoraxanusupe.rf.gd/small_business_grants_2020_alabama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A5 4696 bytes
SHA-256: 7a70393a7e16332390af2d7244b4bae00751996680cb6d203e61ef1353f9958b
font_01_sfnt_off0001b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0AB 11032 bytes
SHA-256: 462229da963887264350773675c368162f79f9903b9338883d937eaee4961c2f
font_02_sfnt_off0001d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D65F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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