Malicious PDF — malware analysis report

Static analysis result for SHA-256 371a2c08a836b873…

MALICIOUS

PDF

81.9 KB Created: 2021-03-08 10:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 629fd185e25f8d1a07603a2900366111 SHA-1: 2748c312c545019e631c9cf93811ee7184719736 SHA-256: 371a2c08a836b87304c8811eea0eada964b9a4fbf54e4eb91656f123881577f0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/wix?keyword=kim+doyoung+brother PDF link annotation
    • http://lifegirls.site/flying_birds_sound_effects_freenr850.pdfIn PDF document text
    • http://idealica-co.site/fake_book_robert_kiyosaki7zlv3.pdfIn PDF document text
    • http://rankingcoach-seo.com/29614109348zaiq6.pdfIn PDF document text
    • http://vukosam.22web.org/quadratic_formula_practice_worksheet_algebra_2.pdfIn PDF document text
    • http://euromarket.pro/coleman_hot_tub_inflatablec9eua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_3ad4ce53eff1463eaa3aafcf3eb1fa45.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_ff1fa7b3d24941d3a638c4b950177b1c.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_140a85525ca0431a8b318c72240d4216.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_13a086b807c047a386f68ee8cc4860d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapexiw/zivinikonegabidolig.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/30099409319.pdfIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_49fdab31e58f4d0b833d7649f9d02251.pdf?index=trueIn PDF document text
    • http://zafipuzekamezu.epizy.com/67720957846.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/finance_tracking_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a91669-5d48-4910-9165-12dc037775f5/biblia_hebreo-fonetica-espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ac946a-fb26-4b63-8dfb-80ede0722108/2016_ram_2500_diesel_owners_manual.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_812cde1071f248cab8fd7c853019096b.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_3d69e4868d60402ba319fcf3313e93cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9ac1871-ed5e-4255-8c25-41e09c78b29e/rejiritogoriwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 4032 bytes
SHA-256: 03e312c59a34b5f908c3af0fddad63731eb8ad7ed2d4d122f224650152f39db3
font_01_sfnt_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 5028 bytes
SHA-256: ac4d4586ef751bf3452f4cb89b36d2aeec2953715441964c848e26f640693c18
font_02_sfnt_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 10884 bytes
SHA-256: 2ea5bef5e4ffeaffa0cf8434b88fb12c9546843893b0738e34cf3ba8669f55d7