Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c313a1d3afadc11…

MALICIOUS

PDF

102.5 KB Created: 2021-05-17 05:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 418748a5cc90aba9ae376016de052b1f SHA-1: c3c526843dc8908b9f230884da9e5364a515d21f SHA-256: 0c313a1d3afadc119bdcb2a9b955c4a12a87511352c8a13172d4288dfc93ef1e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating a phishing or scam attempt. The embedded links, such as 'https://yafferge.ru/strik?utm_term=brother+ls2400+needle+size', likely lead to malicious content or further phishing pages. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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 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.
  • 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/strik?utm_term=brother+ls2400+needle+size In PDF document text
    • https://cdn.sqhk.co/delobepaziw/ghjif4W/photomath_app_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/aSpIhbW/23233049424.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/33hfRgf/filariasis_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_5fdc7e116ea4e.pdfIn PDF document text
    • https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/2000430.pdfIn PDF document text
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/wafolife.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/lojupero.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/BC8jhYk/phonetic_transcription_practice_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/jbhiihk/devil_evolution_exhaust_for_himalayan.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/jbnMbgc/appdynamics_global_tour_stockholm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_606b86dc43893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_6362475069ab402ab66495c785ff2512.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd6f0ad-be3f-4418-8f32-c0d39a866ca6/xijoxav.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_c17f722ee3464c388008a30848de8392.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0df9dd-175a-4d41-8c7b-78f41b74eb97/86809108176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33c8fac-eb7b-4771-93f2-77f077abb5e8/ford_1715_tractor_manual.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_off0001558b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558B 5164 bytes
SHA-256: b8fc96d8265e0dcf01be41a54a13d77163164dcf97a2ec6e36910ad407e43c54
font_01_sfnt_off00016721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16721 11116 bytes
SHA-256: a6588b6c482c79cfcb9289b7457e5e63c856864bcfaa1728b13430a26c3fb923

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