Malicious PDF — malware analysis report

Static analysis result for SHA-256 1705ac1e891a677d…

MALICIOUS

PDF

66.5 KB Created: 2020-12-03 07:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: edf8d5a89da4593cdadca6c3ed6ac40d SHA-1: ffdc2ee188fe4966c56b3669d6a70812bdc86dc9 SHA-256: 1705ac1e891a677d5f9131565edd714c30713f8cf4208e9168b7ce74d4a2d927
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://traffnew.ru/123?utm_term=thomasville+furniture+clearance+outlet PDF link annotation
    • https://fikamuvereza.weebly.com/uploads/1/3/4/7/134754658/wafiwikon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fc1acfab8ccb.pdfIn PDF document text
    • https://kagedevuj.weebly.com/uploads/1/3/4/6/134643161/5400029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_5fadac5ebe413.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/fewuwefuvufu.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/nakofiruzifanu-dexur-wavut.pdfIn PDF document text
    • https://lerivifaladadov.weebly.com/uploads/1/3/4/3/134334847/0ec44ee21964b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0e2a1ec917750a3d7d2c6/t/5fc190849b1ed03538175564/1606520964365/flash_fire_pokemon_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/28491433521.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9fec917750a3d7b949/t/5fc2566e18e72e5fdb23ac65/1606571637112/capital_iq_excel_formula_exchange_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/dujodemefiradukuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27620fc9-56ad-45df-8eea-f2e272d23a5e/nero_x_dante.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd10af4397200107e15e8c/1606226097128/cherry_coffee_table_plans.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA73 5012 bytes
SHA-256: 8dd772ae28a58fb6ca8fbe59f3b19f4ad3ebac829598e9c9ce87d8dc483f1af7
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 10600 bytes
SHA-256: fa3b17b4848342afced2b4e0ed4e71cddb7724ff743eff954ecdf8c0d0d0df14
font_02_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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