Malicious PDF — malware analysis report

Static analysis result for SHA-256 033351a93c8cf815…

MALICIOUS

PDF

74.6 KB Created: 2021-02-12 03:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d5be4bc71e57fe9acfda2466ea451f4 SHA-1: b16517a9c2a23c83c0db5e4719ad23a974c091d6 SHA-256: 033351a93c8cf815fc09daa4e3c3fbd9167aae77ddd328c1093f1088428a8077
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown-reputation URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

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://jottigo.ru/wix?keyword=virtual+reality+apk+games PDF link annotation
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/cc37f1a85c237.pdfIn PDF document text
    • http://top-agent.ru/vapesurnkd6.pdfIn PDF document text
    • http://ita-women.space/potekudemurakosanu9n.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/feERfc5/zesiriwebimodologazaj.pdfIn PDF document text
    • http://gakmancreatures.ru/goal_zero_flip_24_power_bank_reviewjkd78.pdfIn PDF document text
    • http://samelike.site/quikrete_hydrated_lime_data_sheetab81k.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gggIqc0/gugetututaxezafutije.pdfIn PDF document text
    • https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/190894.pdfIn PDF document text
    • http://plusstore.pro/11627077702otsz9.pdfIn PDF document text
    • http://grigolia-studio.ru/jitujavopefw5ajh.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hhjfNxp/79095959290.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/tasikogubi.pdfIn PDF document text
    • http://skameyki.club/tekutotanunibifh8a1e.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/wavoz-genojezadadol-xemojesizepavi-zezumavawuw.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/muforim.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/ac707cb979.pdfIn PDF document text
    • http://xsale.trade/sheikh_albani3fe5b.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/24eebdeda5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakadutof/classical_sociological_theory_7th_edition.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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 5268 bytes
SHA-256: e938a3439bd76048c331078302257ffd2ce843d062d2fe7501fcc89a1beb3dcc
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 11516 bytes
SHA-256: 1ebb17ab79d5489ba78dd081e76904a93d4f3942de4cdae3052389cbaeab9d67

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