Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20c8675d7e3540f…

MALICIOUS

PDF

71.6 KB Created: 2021-06-10 03:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cccd6aca0a4be39cae2b27d9898b36c5 SHA-1: e8003e56cc94cce0a52ae35dd9b077327e445fcc SHA-256: d20c8675d7e3540fa7eb01f93d6ae88588a6cd79bb921d91ba72c5d4537b0b84
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'present perfect tense worksheet with answers pdf', aiming to trick users into clicking the embedded malicious links.

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://pixomot.ru/pbw?utm_term=present+perfect+tense+worksheet+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450502/normal_600f3fafebfcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_5fe11348d3e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_606830979691c.pdfIn PDF document text
    • https://lekodapodigix.weebly.com/uploads/1/3/4/5/134500142/rogodabupam_fesanotuxutata_wasepegimaxeri_rebuzip.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/0b40aebf74870.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/6123550.pdfIn PDF document text
    • https://wijaxogelawatu.weebly.com/uploads/1/3/4/6/134622036/3221365.pdfIn PDF document text
    • https://vurifupilubat.weebly.com/uploads/1/3/4/4/134495287/c2c8d5d2f.pdfIn PDF document text
    • https://selikiwomutarew.weebly.com/uploads/1/3/5/3/135329437/vadinuximewiker-luwejaja-fuxojuxof.pdfIn PDF document text
    • https://giwunoxesej.weebly.com/uploads/1/3/1/4/131408529/wegeruji.pdfIn PDF document text
    • https://mufosuxid.weebly.com/uploads/1/3/4/0/134040625/68867e81fbd.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/2333155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fdffe6171b3d.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/govimumub_lozumi_parubijefekovix_rawan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siwunugilul.pbworks.com/f/vasawimezijeborojamikal.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/6306108105.pdfIn PDF document text
    • http://lerutokib.pbworks.com/f/sipubulad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434919cd-7a83-498b-ab00-e259176f3d0f/how_many_cans_of_sweet_potatoes_equals_2_pounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efd3961-04c8-44ce-bc5f-605954f27ef0/ubiquiti_m2_loco_setup.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/nexisiwadulidevig.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 5368 bytes
SHA-256: 8bb1e43c24d4ecdeb719f3544b598d898440751c63d60a13dafd01fa6e5fe55f
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 10404 bytes
SHA-256: 178b9fa68b33d948249236cfbb029c3caefada8ab3e24a87136ba060730b20ce