Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72353631adc9acb…

MALICIOUS

PDF

78.6 KB Created: 2021-04-06 01:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fc47f23dfaa225f92779351f3edd9254 SHA-1: 29e2cd4140bb85b098d340c7ff39bc9f7410fd8e SHA-256: f72353631adc9acb29f7b25a2078979592fc9a3a5e747011d6e96a0870d36085
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=pyramid+principle+barbara+minto+pdf PDF link annotation
    • https://cdn.sqhk.co/rosivapixove/if0ccio/17615671108.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hdkgdIu/dozef.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/Vryjfhj/juxinasikama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367621/normal_5ff1150941ebd.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/8ea2ddb56f4e7.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/ijbtjhX/bunny_pop_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hcYhb2A/cross_linked_hyaluronic_acid_eye_drops.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/iexYIeA/penguins_animal_crossing_pocket_camp_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd6644389c72.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/THgjvjf/27196614976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fd62848abca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_603f858c4886f.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/5093111.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/2226df4f-c802-4d34-828b-1d448aac59c6/jutugagenimomudekavok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb89a896-cdfc-4a4a-8f1b-968c10a8d848/what_does_it_mean_when_a_guy_says_play_your_cards_right.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fea6db6-0e81-4ea9-99fe-63c737d92e77/26892783593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865c30ba-c601-46be-91dc-22939e0c26a3/80057199624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b46378-42d8-4b42-bc5a-c5dafb4a7f99/the_crucible_act_1_analysis_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fc2fca-5f40-4b5a-b3f8-fe6b02002ebc/diccionario_espaol_latinoamericano_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/405bdf8f-6d63-4ee7-8797-8b5555618ab5/civil_engineering_drawing_tutorial.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_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 5368 bytes
SHA-256: f64abd2a2144084c503ddd45971275e9deb8dcdba3a5754cdab57fb4ffb4715f
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 11188 bytes
SHA-256: 68fb267feb1abf1b4bdeb966f36da012c69d3da8e86acb60702339f143808c2d

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