Malicious PDF — malware analysis report

Static analysis result for SHA-256 f101cebb81f40881…

MALICIOUS

PDF

71.1 KB Created: 2021-02-19 13:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 95754d2cea9135159404155b76edad08 SHA-1: db0763e561a4ed58ca1b4f3f0c2646f98aaa63e8 SHA-256: f101cebb81f4088138df99e1de6f044491e8a913dd20fb1ff8ed312441d63a0c
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, contains text related to a PDF download, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://seumenha.ru/strik?utm_term=celebrate+recovery+the+landing+lessons+pdf PDF link annotation
    • http://interior.estate/checkers_near_me_nowif2zh.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/jVIgghg/earn_to_die_2_part_2_unblocked_weebly.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/xipivedaf.pdfIn PDF document text
    • http://tehnopolis.org/fadujagujenujidyi.pdfIn PDF document text
    • http://buyfastedcircle.xyz/wudubiwhberp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_601a452245139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5fe10ba895e79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5ffe7d1862c3e.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/ifcDsBp/cartoon_channels_on_charter_spectrum.pdfIn PDF document text
    • http://kartaidatodemeleri.com/fabenotidixodilegax20yf.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/donake/junior_system_administrator_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/uncle_tom_s_cabin_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/74949116781.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_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 5624 bytes
SHA-256: 6937fac958d8dbd75a8fd9152af0c6ed5783d690ced331432ffb4ef401fb1496
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 12272 bytes
SHA-256: a0ca388498f3e034bcc384ad875da38c01e0107fb4ad74e54581dbc72be0c50e

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