Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56496231bbd78a4…

MALICIOUS

PDF

75.8 KB Created: 2021-01-14 11:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df885d6d027d854bcaf212c3e55882bc SHA-1: 4838d354ab9d5d19319e637cf0e3f8f6d29f9189 SHA-256: f56496231bbd78a4f8ee6292ed6355c88f566de26522b5463563c3fb68db6fd2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains. The presence of external URIs and the link farm structure suggests the file is used to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution campaign.

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
  • 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://trafficel.ru/123?utm_term=aviator+pocket+scope+pro+night+vision+review PDF link annotation
    • https://site-1172364.mozfiles.com/files/1172364/mp3_music_player_online_shopping.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/tunuxezebugijut-momiwudepu-puzekesizamaga-jopuzakuxusopu.pdfIn PDF document text
    • https://site-1168276.mozfiles.com/files/1168276/54040818428.pdfIn PDF document text
    • https://site-1168413.mozfiles.com/files/1168413/wood_inc__3d_idle_lumberjack_simulator_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_5fa34c3cc4bc2.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/1GrLEjj/war_of_warships.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/jhcigih/smart_classes_in_high_school_for_nursing.pdfIn PDF document text
    • https://site-1178741.mozfiles.com/files/1178741/matitedagamukaz.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/star_wars_actors_died.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5fee55bc5f7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fe7ea02a9212.pdfIn PDF document text
    • https://site-1167955.mozfiles.com/files/1167955/zezopofavozewafifokabu.pdfIn PDF document text
    • https://nirilepewo.weebly.com/uploads/1/3/4/6/134657632/3588030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5f9064b493086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5368 bytes
SHA-256: c5bd0c908e510c7826d897c04a28ac265dc68182658f0c69e77652ca2052c9d9
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10736 bytes
SHA-256: bf239d57f475fe16ec4d1f028c8713978f5283dd47b0a646333f736aee122558

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