Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d9c08e1c4198f0…

MALICIOUS

PDF

77.3 KB Created: 2021-02-25 19:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6f617cc66bcf58b7b38bbc93d53e9fd6 SHA-1: f557c8058d190d4d4d0257158fa290de528187be SHA-256: 67d9c08e1c4198f04f7fecba61943a13ec52a77370c6a356892e54500776eadc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF creation, but the primary malicious activity is driven by the external links.

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
  • 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.
  • 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://yafferge.ru/award?keyword=autocad+free+online+course In PDF document text
    • http://muzibatixabu.mypressonline.com/53592936924.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/what_is_the_little_flock_in_the_bible.pdfIn PDF document text
    • http://tonagruz.ru/motorola_verve_buds_100s5p2y.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/mChhRhj/14099806205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491175/normal_6010ac3851062.pdfIn PDF document text
    • http://iblack.space/hp_probook_430_g6_specs_sheetqwyby.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/81161098634.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/donidizuf.pdfIn PDF document text
    • http://zoo-taxi.site/mclane_reel_mower_rollersuhvp.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/hbhjja2/95340801800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421062/normal_60258a71dbc19.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/lorobiximepije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5ffb9f243250d.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/jgh2Xib/flip_or_flop_new_season_2020_episodes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff3031e9816b.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/sojebelevenex/gurij.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/stop_caretaking_the_borderline_or_narcissist_ebook.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 5004 bytes
SHA-256: 507ba5524fe8d69cc066ca1721e46a4f949adddf56fc11fcc3b1d3d53358cf44
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 11536 bytes
SHA-256: c10eb43a75ab2ee23b5899fbd9d7cd93bf11fc257b996e35bd56a163c13e3798

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