Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4c426ff32f13ba…

MALICIOUS

PDF

79.5 KB Created: 2020-12-30 06:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 76f1d0ee5c62ddcda1233b6dfee0cf99 SHA-1: 28b9c6b2f6244d3eb84282ea1d563869c1f5ed35 SHA-256: 7b4c426ff32f13bab330233384b9f8ca6409ca4fc987537a9dd7f67cea48fbeb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=world+of+light+gourmet+race+guide PDF link annotation
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/4941564.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/vavimefov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f94f55af009d.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/6d028a17e44fbd9.pdfIn PDF document text
    • https://guzarimu.weebly.com/uploads/1/3/4/6/134608133/8218371.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/jjt6KQl/lanobojawikolibojavijop.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/fCKGbib/xelixegunad.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/kinafate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15c02f0e-bafb-46c5-a828-4efa950ff42d/44117049161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1dfb735-1ca2-4eea-83df-261027ce6179/ooze_pen_battery_white_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692eec14-17f8-4f5c-9582-42600f1fe466/53746533039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35276772-a90c-43ce-8d56-27f04e390264/55557517151.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_off0000f15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 5268 bytes
SHA-256: f7f9e7f7f8c9ec132b24ac8676cc9c7789e230580a9ec67a010b6154938274ba
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 13500 bytes
SHA-256: 8335284bc55f2504fa022f8435a9c6793e83c7f593dc9373a5fa7af3901d1832

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