Malicious PDF — malware analysis report

Static analysis result for SHA-256 74793d32bbd51218…

MALICIOUS

PDF

63.7 KB Created: 2021-01-28 07:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4cdda0da7af03a322287049fbe6933a SHA-1: 8c032a864db91697d8f7942cf5af4b6e856c303f SHA-256: 74793d32bbd51218fd7971dcc87de7bbb6f31ccd099a4e52280552869785803a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the links, suggesting a phishing or redirection scheme.

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
  • 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://cctraff.ru/wb?keyword=skin%20cartoon%20cat%20among%20impostora In PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/xuxakux_biluwozotizise_gugemaliwi.pdfIn PDF document text
    • http://futegejetebe.22web.org/70819673370.pdfIn PDF document text
    • https://zenorawe.weebly.com/uploads/1/3/2/3/132303237/9ac4e3e.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/2910112.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/I1iihhC/betta_fish_live_wallpaper_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527237/normal_60031e64a8362.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/igiuxgd/75733208925.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/zanunelovu-pometoxazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wubogijogazerew.epizy.com/marblehead_reporter_twitter.pdfIn PDF document text
    • http://lepugip.epizy.com/survival_instinct_battle_royale_game_apkpure.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/ihya_ulumuddin_imam_ghazali.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/animated_emoji_for_facebook_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/siran.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/grammarway_2_answer_key.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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 5388 bytes
SHA-256: 46953812029fb77557b18a5c4b6ed5be0f9f1cd6035a716b88848f4ce52cdf6d
font_01_sfnt_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 10100 bytes
SHA-256: cfb2163acb4341a39c88c25b6ebc4b6ad29858405ac41750b2e34666658f6a90

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