Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23e680d0ff50e2b…

MALICIOUS

PDF

83.0 KB Created: 2021-04-19 10:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 113851b9524329447913b0049bf48320 SHA-1: 3ca359bda3d1ccf31474e90e4d6a34d07f15d8d8 SHA-256: c23e680d0ff50e2bbdd40fdf1820ae2c8939de840b8aee7f3a450b4dded4d8c5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many pointing to disposable domains or file-sharing services, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=line+6+bass+pod+pro+rack+mount PDF link annotation
    • https://cdn.sqhk.co/wafavalufa/gblijjb/off_road_motorbike_riding_tasmania.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/segidulamupe.pdfIn PDF document text
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/xatiroli.pdfIn PDF document text
    • http://depafelevan.22web.org/34668615869.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/jixipivos.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/pThcgjR/rotating_electrical_connectors_used_for.pdfIn PDF document text
    • https://bufofeguwozeder.weebly.com/uploads/1/3/0/7/130775144/maneboruvodobaz_pigufirejaror_lobowidi.pdfIn PDF document text
    • https://cdn.sqhk.co/varugefezum/dFicgfs/16068442519.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/LpBegi3/blockstarplanet_unblocked_at_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fesogowen.epizy.com/xenelujepezepotixej.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_b6579171d60144b993f74929e847b1d0.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_5a69059714af48a994f2872ef42664ea.pdf?index=trueIn PDF document text
    • https://bee08bb6-d8c1-4cc5-89f0-d6ac88a4f64a.filesusr.com/ugd/8b8a1f_be1c0b1b69474e07b8ecf80ee8b65736.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a0d141155819490989953ff3fd175e50.pdf?index=trueIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_21984494e7fc4009bd3c7dff5d85bf76.pdf?index=trueIn PDF document text
    • http://mevexunimapo.epizy.com/9774748493.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_c29cf79104a5435c860db3bd0ad7fc0c.pdf?index=trueIn PDF document text
    • http://mesujitoz.epizy.com/wogitifeliwofizex.pdfIn PDF document text
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_f6a606d9e211464fb9d520f9f479a820.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7292d8f8-c015-4daf-af21-0ac1b83b1fb1/jesus_be_the_centre_guitar_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f98587-dedc-442b-8117-db9a0f8925e2/cycleops_fluid_2_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03acea18-58cc-4261-bb8e-c5c1aacb76bd/jebaluxu.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_aa3345b7245849888f9d7eb4b45b264c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32d06a9-660e-4f26-b884-09bc55485720/36468835511.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_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 5488 bytes
SHA-256: 237f008d0a91f536e1c333eedde048b8f50c987752f3b18f75f1ff7e58fe367a
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 11148 bytes
SHA-256: 1a13302c64c0a554ce19a1287f06e0055bf98f1254556b82a2efa9eac571fd4f

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