Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa47a8020938ef82…

MALICIOUS

PDF

81.5 KB Created: 2021-03-10 22:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 37203e4613ca52d80a7044fec083d017 SHA-1: d4357577b98fde0074b907144ed254d50bef5d8b SHA-256: fa47a8020938ef82d941746682b3e7a183c5187742ec56595111a5d421ea2340
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/123?utm_term=codycross+answers+group+114+puzzle+4 PDF link annotation
    • https://cdn.sqhk.co/fegozanodedu/Mpid29l/wood_cutouts_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/agdTkrq/61022572519.pdfIn PDF document text
    • https://losikopak.weebly.com/uploads/1/3/4/6/134616488/f5eeb8f3.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/kutikaj-rawuzem.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/sisumekibutoz.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/wesixowosuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_6024e8d043f74e5ba353d09e844e4735.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_1c4099a5e2674204b30665f1667074b6.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_878a6761de3549a3ad00f578c73e6b30.pdf?index=trueIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_a9fe53a0b0084cd28b41f052fc9270d1.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_f08f62c633b948e8997f181a1d53b5fd.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_62be5025b2974ceb9b551825277e87c0.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_b599308f943e41f5bee34eb17f19e61b.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_188530052d374c398a715fb89a6f001f.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_889d877e0a7b4aca8ec042e69aec93b6.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_f59112440f2243cab8a295012edfe108.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowonovege/application_form_for_employment_insurance.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/64326267448.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_fb662b0fb6ae4a48b53c76b794c081bb.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5c4a84b042104414821f51aa8202c5ef.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_0c592f0b12924388993ba825fc31fa7b.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_d507c1126e8f4eb89c56d4f4732e6ac3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/92639503789.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_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5532 bytes
SHA-256: eb635a9b3bc51e0caac829214a6a2956081fa54e355b2b6aa26670f5de1d05ef
font_01_sfnt_off00011393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11393 10792 bytes
SHA-256: 920f7783327536f7052fd6868c2a50fefd7fa20ba52b15f98d9ac775d5db5b50

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