Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d31164f517ba6e…

MALICIOUS

PDF

79.3 KB Created: 2021-04-02 22:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 513fb67a7459092e1e4662080dd92e64 SHA-1: 5196cfa284ac90956f6d1849a131a8f5426e2d92 SHA-256: 44d31164f517ba6e405e2bf34870e550fb105c0446bf95346b82de3072fdc018
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 0.9996

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://gimoguvi.ru/award?keyword=antigona+jean+anouilh+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/zoravuzulop/hckhhhe/92294107622.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/ihxNnsI/football_coaching_drills_for_7_year_olds_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/rjfbjeH/88684368142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_605da09007f9e.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/6650545744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fffd9bccb38d.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/8eYqihj/28541086071.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/xwhe3oo/thyroid_function_in_pregnancy_guidelines.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/fe2_fe3_redox_potential.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426814/normal_5ff6779d415ea.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/wazorixekunafob/division_tables_worksheets.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_ebba419e894246df9e3f0ffe3909a787.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_2603bbeef66547b19ae8259fc30c2d34.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_1ca1b6cde41c4a0082e85595f85adc3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/nojunovorenakemat.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b98d2d9dddba42c5811aa1c03d50a65a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/45874540620.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_85ac9bac414e4c79848e3338c1fb9449.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ca1e9d-3103-4fda-8fc3-c0317fa48b78/82082970420.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/gubaruzutubinovebozagasog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b6ea31-fdf5-4f0e-b92f-286d44f70578/pokepapavukipizadanokade.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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 5484 bytes
SHA-256: 21dd18b45142c533a8684b460d9be3e338c100d6c65fac018513dc5d2202ce41
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 12336 bytes
SHA-256: ce23daa233e00ed7e77d8846b4f73fe9a07d34a86db4143d5eaa09dcc188768e

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