Malicious PDF — malware analysis report

Static analysis result for SHA-256 85efb0cef55b4eb8…

MALICIOUS

PDF

71.5 KB Created: 2021-01-25 21:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 65aa1326e8bb377c359cc36d9a279cbe SHA-1: 0043f0ee8f76b49b0ba5f1b8daca8a687aedd6fc SHA-256: 85efb0cef55b4eb8b3bb1ef5fa88395355d2425115364d3db5ff61aaf69acf43
192 Risk Score

Malware Insights

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

The PDF contains multiple links to suspicious domains, including one identified as a malicious redirector. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The presence of a "download button" lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=employee+of+the+year+certificate+wording In PDF document text
    • https://cdn.sqhk.co/kekumumaxow/ibgg0Hz/walkthrough_human_simulation_fall_flat_dark.pdfIn PDF document text
    • http://lelonul.iblogger.org/odontogenic_cyst.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5fe14f6000d39.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/38785315755aevx7.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/W5Gif4C/winklevoss_twins_social_network_actors.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/c98iecQ/32681764077.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/ahfL77H/new_york_and_company_clearance_summer_dresses.pdfIn PDF document text
    • http://ketousa.site/144491637541coxo.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/Oyjc2hf/pogiwago.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/ic3slja/checkers_by_dalmax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_600e5ec86817b.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/WLXGw7v/74965932734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5ffc6c641e425.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/godewumazek/dyslipidemia_guidelines_2017_chart.pdfIn PDF document text
    • http://gevegure.rf.gd/carb_cycling_diet_guide.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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 5544 bytes
SHA-256: f4a91691c5c7f948475b49c30faea114224bd4cc887476f8b78dab7e057858bd
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10008 bytes
SHA-256: 7123718e08b8be50646e8abd88536519d90b8d038d3cbc433843aecd3486c46f

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