Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5acdaa54e52ba6…

MALICIOUS

PDF

66.3 KB Created: 2020-12-25 23:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 81d84afa07a98f3701634af59087ea43 SHA-1: 3121fa6e0c4342f8cd1cbdf1b9de636f0b50bd21 SHA-256: 3a5acdaa54e52ba630fb001792380a85afd419e80039b31f6d5c8b160c683a15
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The embedded URLs, particularly the one on trafftec.ru, are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=architect+draughtsman+definition PDF link annotation
    • https://padavosasosak.weebly.com/uploads/1/3/4/6/134632247/3fea589b.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/bdf0b371.pdfIn PDF document text
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/8028051.pdfIn PDF document text
    • https://lodufowuk.weebly.com/uploads/1/3/4/5/134593986/4857288.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/wadosavivewu_givuvuvomage_gufavalegetofu.pdfIn PDF document text
    • https://mavakonagidesa.weebly.com/uploads/1/3/1/4/131483278/momedowekamej.pdfIn PDF document text
    • https://ritobawen.weebly.com/uploads/1/3/4/4/134486043/silinijaju-jadozakav.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/ihhcBhd/leputixadafajukedel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pukiza/diferencias_entre_respiracion_aerobia_y_anaerobia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2774da-450a-4954-bf72-dd2b8a3ba973/wegutobogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a17851b-36fc-4faf-91a3-e2432f6c0b68/minecraft_1.8_9.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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 5392 bytes
SHA-256: a55843e8d10e60bd37e067323415404a15066f3ed56ece7690c8be1a1653f39f
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10060 bytes
SHA-256: fd194149cd891544a4286b0a9feea8d9faa425f46f5a9f9bf044e9912e188ddf

Open this report in the interactive analyzer, or submit your own file for analysis.