Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f7add9ccc3554…

MALICIOUS

PDF

66.3 KB Created: 2021-04-01 01:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a09110d542305ff5041165e6956c7804 SHA-1: ea0b3fb2fb027def80626a2d9b4e186e2180530b SHA-256: da3f7add9ccc355454a01ed8b51e5877e878c960d8694d1a5037aac95fb30671
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://jacksth.ru/wix?keyword=precalculus+graphical+numerical+algebraic+6th+edition+answers PDF link annotation
    • https://cdn.sqhk.co/bopibege/highdgd/fexazomebolixivilezaxav.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/when_we_dance_lyrics_meaning.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/94507628968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402718/normal_604ba88101fc8.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/vQiaXeP/21814870622.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/best_short_stories_for_high_school_from_other_countries.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60183e69004c8.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/gies1jc/forinosonajugavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_602ed6552f70b.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/wexovajumunaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fujikapoji/gh2wjbw/52122549526.pdfIn PDF document text
    • http://nncucuucuc.space/jijemefg03i.pdfIn PDF document text
    • http://iranianvc.com/titetapunojopifift5na7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/descargar_catalogos_andrea_verano_2020.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_ddd0055986e44a20ab12c577a2b14f37.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/albinism_disease.pdfIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_2347163542df494c9b1dc5b6076ed768.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_73d9d00361e34d739917e9f8a02dfc99.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_6d67d5e2708f4c1ba1da17cf1e428c8a.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_off0000c280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC280 5872 bytes
SHA-256: c2244b8ade545379ce22c39092287b1e5d6f148da0acef7b55b1f0d2a9f45a04
font_01_sfnt_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 10332 bytes
SHA-256: 3df8c58529804e68ec4a647df5f9fbae32b2f78fae248f26612291a222ed7607

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