Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e91b6651410ba…

MALICIOUS

PDF

76.8 KB Created: 2021-03-31 10:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cfd99e26ed53c8d3fd2549cc897f8b06 SHA-1: 01159556f2e4715f6d46aabc2f40b535cb0b5578 SHA-256: 923e91b6651410ba2fa46a26092cd9da85623188d1b933801cfd9244445bcf72
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the link farm behavior. The presence of external URIs suggests potential redirection to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=basics+of+java+tutorial+pdf PDF link annotation
    • https://sifavebizibi.weebly.com/uploads/1/3/4/0/134040704/e3bfb37e19.pdfIn PDF document text
    • http://damokemibojer.iblogger.org/best_online_degree_for_information_technology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_603e40abdc5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6039cf4e5ffc3.pdfIn PDF document text
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/c39485d3626dd.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/BIijbgx/clinical_cardiology_made_easy.pdfIn PDF document text
    • https://wolegowagu.weebly.com/uploads/1/3/4/4/134404953/d88c9a7ac.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/lifatet.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxigu/wGC6Dje/hiring_flyer_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufojigox/ggh0OvV/vande_mataram_full_video_song_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/8yZgdoc/logo_quiz_answer_53.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/zogeme.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_605ca2007ec4f.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/igd2ygg/formula_1_qualifying_results_russia.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/6735055.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/8815614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukorow.epizy.com/windows_7_pro_media_creation_tool.pdfIn PDF document text
    • http://gujusama.rf.gd/watuwekadiwapesugewoxemob.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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5336 bytes
SHA-256: 1db8405e6dd7b0e86740fcda1535f941458a7ceb857286933912f51026aa3438
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 10900 bytes
SHA-256: 72aba76a9362e203717e40fc21aa3e72a25ba9f867d8aae4034b3283fe713771

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