Malicious PDF — malware analysis report

Static analysis result for SHA-256 af19f17dd0c41fc6…

MALICIOUS

PDF

71.5 KB Created: 2021-03-06 00:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 308de42665ed4a9f973ebbf05ef9f9d7 SHA-1: 6906d188e9b5fc7e232e9fbcf25dbb771038cbad SHA-256: af19f17dd0c41fc677ef5179ab8d98e607f6a146fdff4d9ff503a117cf7576f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/strik?utm_term=verifone+vx570+tamper+system+mode+entry+password PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468563/normal_60282f2a7f84b.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/10_day_smoothie_challenge_recipes.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/31149101105.pdfIn PDF document text
    • http://alfa-quest.ru/ronodinavivedi2ypia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_6020d748aa062.pdfIn PDF document text
    • http://poradoit1.site/libavowad4q9tb.pdfIn PDF document text
    • http://sputnews.com/8386736009q9jrk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_6018da39a8e84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5fdd1b6c881ca.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/suguwumifunepibov.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/9356485960.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/how_to_play_a_2_octave_d_major_scale_on_violin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fecbbd70e1b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5ff905fe11266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_6042ab331b521.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/a9c1cb01-bf07-43a7-9ac2-988ef4e45b24/8739371307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dee4e38-f75d-4e99-bbc1-40a23d42ea8c/wopoxen.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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 5788 bytes
SHA-256: 1ca5d0bea24fd8254f81da2dc2a560c89db7f819b51dab9b57f5df446ec2ae07
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10208 bytes
SHA-256: 1dbbcd8275c63bd846df609cc77de3cd23f6faeb1f141007458e4f037031eabb

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