Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ce1480cbbf4a07…

MALICIOUS

PDF

74.9 KB Created: 2021-05-10 15:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1567174a6621dc62941aab93274fe96d SHA-1: ee19efeceb99353b482f9a34676230fd9f713d4b SHA-256: 42ce1480cbbf4a07b6552ed2a9f160fe904e3a42f1e53d71b95f02077bae5ce4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. The document body, though heavily obfuscated, suggests a lure related to a 'Keurig 2.0 manual'. The presence of numerous external URIs, including one pointing to 'jacksth.ru', indicates an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=keurig+2.0+manual+k550 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450631/normal_60235a4852453.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/pjjgfIb/the_secret_order_2_masked_intent_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/jgj6igs/pixlriffs_minecraft_survival_guide_part_25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fd3cee6be5bc.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/63132484865.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/FbXgiPQ/jepedetikidolamo.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/jdhjvYS/sogixogerasupovi.pdfIn PDF document text
    • http://zofugam.iblogger.org/sizoworiwuxogebi.pdfIn PDF document text
    • http://refazali.mygamesonline.org/fomubigegexag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_5fdaac4bf05db.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/hffrjf0/59128267883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_605d5cf261203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikirubuguje.epizy.com/relative_pronouns_english_exercises_with_answers.pdfIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_f8d83a9008bf4935a6f085cb511d8de1.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_002062f8ed18407f8b5b0dfd697d1bd4.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_317bf047d320425987840aad23c42415.pdf?index=trueIn PDF document text
    • http://vopezaxaf.epizy.com/shoulder_exercises_bicep_tendonitis.pdfIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_b64f6aab9a5d4c29932776eaf851933e.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_9629ce695c9a44e99b643c96b0d060fe.pdf?index=trueIn PDF document text
    • http://gusagikatu.rf.gd/51647256999.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_613addc7fedd49da818ee7016c2c9259.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_bb2e98e65d094a78aac54b5f425f77f8.pdf?index=trueIn PDF document text
    • http://xekujigifur.epizy.com/65372162205.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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 5292 bytes
SHA-256: b2f6a5c45ea7b0f6e3c6f4ad82ee8b2698be1de05990e52b72d11d6a76d6c623
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10576 bytes
SHA-256: 536b7b0d3b74c4cee6f057fa078f23d1034a3b4afc8bc081bc7b91cc21aaeb27

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