Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ffb83835d24223…

MALICIOUS

PDF

77.0 KB Created: 2021-02-27 23:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 604fd87e41fe6e0b10e64d2a4d762097 SHA-1: cf7ba6d7a956814f16a63568c8d20a2bb11c7c6d SHA-256: f9ffb83835d242238e90524d23aca16d6badf3838d0066e1447dbb53b2403940
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it is a lure related to a treadmill review, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=proform+505+cst+treadmill+review PDF link annotation
    • http://trysoda.pro/a_theory_of_human_motivation_original_1943_article_by_maslowxpey8.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/dyjepyf/my_little_pony_phone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/iiiciDs/99_woodcutting_guide_rs3_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/agiAhh6/3_guys_funny_movie.pdfIn PDF document text
    • http://energierecrute-emplois.com/meluvudirexubuwudofejurag32jy.pdfIn PDF document text
    • http://instasurprise.online/39003644352r9ix4.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/ciaFjjf/card_scanner_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/dBAPgh3/jump_rope_training_videos.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/kindle_fire_hd_7_3rd_generation_cyanogenmod.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/hgtRfoo/fiximunabil.pdfIn PDF document text
    • http://pearhaidhr.fun/vaduz5cbwj.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/ditiruz/13542104497.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/79510893066.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/conair_weight_watchers_plastic_body_analysis_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/79942456732.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/contax_t2_t3_difference.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 5588 bytes
SHA-256: 8e82b8106d0ac186c394bb2c6fc2da08ec1b06488371b64976d493017d5069f6
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 11244 bytes
SHA-256: 0da4015931e6282c7295b7dfe71babeb7130bbb09ac7847ee95f757b6c4dd59c

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