Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f83e8173fa46a8…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 12:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c8ea01d1be65e3e87deb710bfe16a3d0 SHA-1: ed06fcadf3592a9fe6d45f63eed094794f190cea SHA-256: f6f83e8173fa46a8d37fef5496cfca00eef4e49a3f983876ad4a0083f760e02b
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to harmful sites.

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://yafferge.ru/123?utm_term=getting+started+in+electronics+pdf+forrest+mims In PDF document text
    • http://uscarinsurance.info/today_sandesh_newspaper_vadodarapzm3i.pdfIn PDF document text
    • http://milky-rp.space/history_channel_vault_subscription5fq5p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_601bb2fcdfa6f.pdfIn PDF document text
    • http://save50.pro/keralizy7hrk.pdfIn PDF document text
    • http://milanbeachs.space/2563233786705m9s.pdfIn PDF document text
    • http://hempmap.ru/wireless_earbuds_for_lg_tvq5gll.pdfIn PDF document text
    • http://obmenkalnr.online/forecasting_techniques_in_human_resource_planningujmh4.pdfIn PDF document text
    • http://kyponnik.online/ditiritisapelifibezivyylb1.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/fjhhhSa/78723095953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60184f071b970.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/YTidiJ4/5514395421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_6019834b7386c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5fd3848ec47bd.pdfIn PDF document text
    • http://rabota-plus.club/atmel_studio_6_tutorial1i45a.pdfIn PDF document text
    • http://dirtygirl.fun/what_is_a_tok_knowledge_questionpbeft.pdfIn PDF document text
    • http://antileqphh.site/1193762738nn4e7.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/wunojipu/what_is_the_theme_of_the_lesson.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/66865599567.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5508 bytes
SHA-256: e017bbdad64c6ea17b3d4637221c18808ba936e51a385d0121b51a6768858374
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10408 bytes
SHA-256: 37e6b0ed6ba6d38e43bd4ac16afed37ec8443908c575e0d88dafc09f47b482bb

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