Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c2fbe1fa01da4e…

MALICIOUS

PDF

72.2 KB Created: 2021-02-19 06:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9963b31e6b4b2cc506aaca4af9e8c515 SHA-1: e7b8357830dfa35d2a282f29e864f2ca3078bfc7 SHA-256: b1c2fbe1fa01da4eae26135a9a5b9dccac00dc7024dc735c0df8ea67a944c14c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily garbled, suggests a lure related to sewing machine instructions, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+to+use+a+bernina+walking+foot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417318/normal_600f037cc1c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5fe9b900111d8.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/NgejWjc/sakura_school_simulator_apk_mod_versi_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/hcgdslK/ladiwiwususukuwibuniv.pdfIn PDF document text
    • http://ubzvp.com/sumimipnfbw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_60053c2b95816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5fea062518b63.pdfIn PDF document text
    • http://copyright-security-ig.com/tituletu97jcq.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/cmohgbM/cute_wallpapers_for_ipad_mini_2.pdfIn PDF document text
    • http://lightly.store/rojatuxapezodomijonekodu1xmy.pdfIn PDF document text
    • http://boost-store.net/minwax_wood_filler_color_chart647vv.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/ibghjJP/mini_ninja_turtle_figurines.pdfIn PDF document text
    • http://qunit.space/47322809482lrab8.pdfIn PDF document text
    • http://gonugotez.22web.org/50781401440.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/jjjciiw/vumafulegeguzij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lidikulogape.rf.gd/12495263493.pdfIn PDF document text
    • http://xevotoxukapo.epizy.com/vogimizovubexu.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5192 bytes
SHA-256: 38872a0f73c309d82107ee91ceb05876e1b295d39abbd5c3e1abe43cd78ed81d
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10868 bytes
SHA-256: 955d532c734e6a54bfc715f4750d15d6fa7ab8476da138c7ddd0cfb90ffa23eb

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