Malicious PDF — malware analysis report

Static analysis result for SHA-256 b050653cf8d72b43…

MALICIOUS

PDF

79.0 KB Created: 2021-06-03 23:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a0926bed7f256b8e755a0305404c75d9 SHA-1: 58edc45ad6f5d43532487837a971a538c5506793 SHA-256: b050653cf8d72b437c21c9d53618d128dc276a3993131bd65d14584bb9a704a9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/123?utm_term=damask+sheets+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375908/normal_6064bd82f3dfd.pdfIn PDF document text
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/501c10c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fdb1b3d65d92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_60049e2da79c0.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/nakep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_600c78ee50f04.pdfIn PDF document text
    • https://welogodeketi.weebly.com/uploads/1/3/5/3/135326703/japafevev.pdfIn PDF document text
    • https://kowirakixodoxe.weebly.com/uploads/1/3/4/4/134467502/razorasogi_ziteru_wexiravef.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/jufodaruwa-sukaz-kugana-mekigujok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385424/normal_5fec23a9e8924.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/gevidofijogawe.pdfIn PDF document text
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/mebalelezexur.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/0ad1222e1bf8b4.pdfIn PDF document text
    • https://gagemixe.weebly.com/uploads/1/3/5/2/135295047/7221874.pdfIn PDF document text
    • https://ruwufinojib.weebly.com/uploads/1/3/4/6/134643146/9421580.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/gomevowowogenubej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab91f3e-e8a5-43d8-981d-296fc75b7785/locke_essay_concerning_human_understanding_book_4.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/fodawematesojagaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74b8794-85c6-4c65-8cfc-cc4d0550a7f7/gofarazobipuseledoxomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fc1c03-b2f1-4045-acdf-6f06b0b85aac/thrawn_trilogy_comic_read_online.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/99936383274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee9f81-38fb-4307-bd96-a4fc44d52bb3/is_the_utah_notary_test_timed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb44d86f-2257-475d-8b24-344d0dceca25/beats_by_dre_commercial_naomi.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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 4972 bytes
SHA-256: c117c594fef38597151e00f22536521cf7bfe39031a13919f974f69a19056da9
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11260 bytes
SHA-256: 024bd4bc03b428dc2c0a09ee6c026c370168828201678b6c10619353f58c7ce5