Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cfdc137a315a3…

MALICIOUS

PDF

82.0 KB Created: 2021-03-19 19:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f544591954cb65c7a058c636f0e35ff SHA-1: 88d10d031ce4b2570149f459bd974ebff162ba98 SHA-256: 2f3cfdc137a315a3e6b7f0c41de3af68ed6f930dedbc023914203bd888eb8cce
186 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 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 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://pelibifir.ru/123?utm_term=subnet+calculator++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491670/normal_602f95f5bb393.pdfIn PDF document text
    • https://cdn.sqhk.co/xedomobedusi/aIfiaYx/toniwigajeminedexoguwe.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/gerggg9/83480722995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_6049dcdae8cbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601cbeae54b00.pdfIn PDF document text
    • http://blacktea.space/79645724042w02ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5fd26981b0f7b.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/6ggqie6/55435686054.pdfIn PDF document text
    • http://zalavsky.ru/application_letter_for_a_job_examplen0r27.pdfIn PDF document text
    • http://circleshtang.xyz/o_que__capitalismo_coleo_primeiros_passosvalt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fde69390fa67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5ff683dc7b6dc.pdfIn PDF document text
    • http://tosety.xyz/ci_tt_mt_trong_ting_anhs4fip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152d19dd3b2.pdfIn PDF document text
    • http://guwelureg.22web.org/ridgid_air_compressor_parts_of25135cw.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/nujg0jd/96516500881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebogozomusedom.rf.gd/wepukuvozewavufamawiwasa.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_a8f9fb573e284f699aeb9a8252e9c788.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_166722dcc4814792bfa968e5e979317d.pdf?index=trueIn 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_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 4940 bytes
SHA-256: 69f3f6ec3f2c26689e5e1532a280143296d2289f7d46e8333d02bd28545f3c90
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 12440 bytes
SHA-256: 2ead4f94818d54f2dac5564c75b001591393fdc927a32988cc95c198f0bd3c17

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