Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7d2b58bf6f8774…

MALICIOUS

PDF

81.5 KB Created: 2021-03-04 22:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0dac29ded81456a5ea534257de257efe SHA-1: b1f3828a1d325a52ecb2b9285e4ad481177fd030 SHA-256: 6f7d2b58bf6f8774baea8cb5f67694a316b962b9731b1cf9cd959d41dca4ced6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and employing UTM parameters, which is a common tactic for phishing campaigns and malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=the+wheel+of+time+book+1+summary PDF link annotation
    • http://sberbank.link/93950013404p4614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_6013d83fdf729.pdfIn PDF document text
    • http://fipevowes.iblogger.org/sub_zero_drawers_not_cooling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_601c96f1e3560.pdfIn PDF document text
    • http://demask.space/management_des_entreprises_coursoi42t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_60381070103da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fd06717a37bd.pdfIn PDF document text
    • http://trenolgia.buzz/google_forms_in_sheets655sx.pdfIn PDF document text
    • http://fesabip.iblogger.org/78809428534.pdfIn PDF document text
    • http://fusobilel.iblogger.org/free_game_karne_ke_liye.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://tamakibegotilo.epizy.com/65958999964.pdfIn PDF document text
    • http://kusegewamuzazod.epizy.com/blue_java_software.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_433740e3f506485dbd9529ed4c186418.pdf?index=trueIn PDF document text
    • http://pitepune.epizy.com/darshan_shastra_ke_question_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/16169069888.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/ycmou_ba_admission_form.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_cbc5a371001d47beba755fb1aa367ce3.pdf?index=trueIn PDF document text
    • http://rogidisili.rf.gd/sogepaluxolixiwasufa.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_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 5184 bytes
SHA-256: a1ca042c2d94711251b17367059c605a7388b20f8f03009156bdb147c88ad509
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11296 bytes
SHA-256: 5acdb0f03ab8e04362093b6507c0ea2e6db89fcc4cb9b78a9db4406a8c73775b
font_02_sfnt_off00012ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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