Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e01a21e57d92c4…

MALICIOUS

PDF

74.6 KB Created: 2021-04-01 08:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96d1f62cedb04926c906936778ee7d64 SHA-1: 1184c908b90b97922916d86c68242ff3da6eb196 SHA-256: 79e01a21e57d92c417d88288da515480d89e56e02ededeb94c860575619cca35
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 0.9993

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://botokaw.ru/strik?utm_term=what+is+the+purpose+of+writing PDF link annotation
    • https://mutebomex.weebly.com/uploads/1/3/2/7/132740724/jaxikidevi.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/4933474.pdfIn PDF document text
    • http://mmeueue.space/bad_piggies_keygen_activation_keyspdtwi.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/d3d36d02d.pdfIn PDF document text
    • http://botefin.medianewsonline.com/difference_between_euchromatin_and_heterochromatin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_602d8e589a793.pdfIn PDF document text
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/dadoniralodaguva.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/858bc146e085d.pdfIn PDF document text
    • https://zedebofewel.weebly.com/uploads/1/3/4/5/134594015/radijigeka_xiwenid_jubijulopizebum_pilevaxozijeni.pdfIn PDF document text
    • http://subbellassecret.com/bupemabowalikofifivizdhhx4.pdfIn PDF document text
    • http://ledy66.net/64014730857uzg2j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5fd84a55ca173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_60508fb327b58.pdfIn PDF document text
    • http://fruitslope.online/84497680131t2b78.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/vavovisotanomedome.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/6163675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_602733ce8809b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a69719-1ff4-45f2-823f-0ddb2afceec9/how_do_you_change_a_honeywell_proseries_thermostat_from_celsius_to_fahrenheit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3e60de-b174-4783-accf-e8eb31b191f8/when_to_harvest_sweet_potatoes_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81db410e-fd81-43d1-b5a1-286acd611c6d/kisuwewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dc84ee-5737-4f65-902c-bab2e639a057/sewukipomojureti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce537eda-0077-417d-83f7-be38716d5910/what_is_the_shortcut_key_for_strikethrough_in_outlook.pdfIn PDF document text
    • http://baxewape.myartsonline.com/19982417174.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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5236 bytes
SHA-256: e26549b8386f597a9292b3590fe62e922a913179b9cff53e4147a1c663927893
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10860 bytes
SHA-256: 6d7c70938e6c89a64c03ec3c4df3c9c99a6a935178e4c8ed9de594cfcbd21700