Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3654425c4959aa4…

MALICIOUS

PDF

79.0 KB Created: 2021-05-31 16:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b616724b1414489ea8f35ba72a931e55 SHA-1: 0a30209519b1ff1d2a9c2b8b77a2baa028ac89c1 SHA-256: c3654425c4959aa416395677cab153964d7ac7d0c4868c47a33331701f272f33
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://maypoin.ru/123?utm_term=media+interview+techniques+pdf', is directly associated with the document's apparent theme. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=media+interview+techniques+pdf
    • https://cdn-cms.f-static.net/uploads/4457281/normal_603502c014aa4.pdf
    • https://cdn-cms.f-static.net/uploads/4421333/normal_601a455487cdc.pdf
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/2381659.pdf
    • https://cdn-cms.f-static.net/uploads/4403540/normal_601b93a27cb96.pdf
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/5512193.pdf
    • https://static.s123-cdn-static.com/uploads/4499334/normal_6000dbdb2af02.pdf
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/vuteratitar-titatarep-jafidiwaton.pdf
    • https://cdn-cms.f-static.net/uploads/4413118/normal_6052fb654c19e.pdf
    • https://static.s123-cdn-static.com/uploads/4388048/normal_5ff891cb776ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d42b36b5-a93f-40ef-97d1-ede98592532d/42734868970.pdf
    • https://uploads.strikinglycdn.com/files/8ddd9c37-b568-4f08-a297-8fa84ab9fe66/how_to_replace_ear_pads_on_bose_soundlink_headphones.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144412233/14956861975.pdf
    • http://lekuzax.pbworks.com/f/gelebonegulufowatuwaf.pdf
    • https://uploads.strikinglycdn.com/files/dc9e20a6-e4b6-4ff9-8832-dbf763230698/svt_6me_tableau_germination_lentilles.pdf
    • https://uploads.strikinglycdn.com/files/8fed636b-9846-4d2f-84c9-fd589f618cfa/fisher_price_auto_rockn_play_canada.pdf
    • https://uploads.strikinglycdn.com/files/ec09e83a-4bbd-4c87-be2b-05153b4a8bb0/zikosarefoxerejikimefibar.pdf
    • https://uploads.strikinglycdn.com/files/e69048c2-7fb9-4955-b1d4-a9f9e104529f/remedio_para_el_ardor_de_garganta.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f828.bin
5654b714eb031313f94a695c7e15ce37c31807ec116b0c7bdc04cdecfc257c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 5492 bytes
font_01_sfnt_off00010af0.bin
c237bfe746f9e9f8a710e5434fb5620f9fc754884c7244e77c0471ce443458b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 10516 bytes

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