Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec50b85a124375bd…

MALICIOUS

PDF

82.1 KB Created: 2021-04-19 13:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9bc8aacdc45c1cb2fb1b1db12ad28ef6 SHA-1: 903b62bd889587a5ecaef2e26064eda768a899ba SHA-256: ec50b85a124375bdbe622a4a82262d339027297e17b73b1c15c5cf42a35bd67e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers confirm the malicious nature of the PDF, with the ML model outputting a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution vector.

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://kuzutuzo.ru/strik?utm_term=mortal+instruments+tv+series+ending PDF link annotation
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/sidod.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/ehdjeOM/zenonia_5_classes.pdfIn PDF document text
    • https://putajomarope.weebly.com/uploads/1/3/1/4/131437676/d52e6d65518.pdfIn PDF document text
    • https://zokatitolef.weebly.com/uploads/1/3/4/7/134702636/musizona_gebefemow_ludanawegol.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hgegdOx/78343265298.pdfIn PDF document text
    • https://fewurigog.weebly.com/uploads/1/3/0/9/130969621/6863349.pdfIn PDF document text
    • https://madisilusira.weebly.com/uploads/1/3/4/3/134321428/daxexuj-geraxaje-gitedimop-welawipozut.pdfIn PDF document text
    • https://busejutepegojo.weebly.com/uploads/1/3/4/7/134773147/xunedadex-pumipalibune.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/85c8fd574f29cb.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gerYsjj/76973506034.pdfIn PDF document text
    • https://tijovozup.weebly.com/uploads/1/3/0/7/130775490/jotunotivovelivasi.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/Rjahfib/frog_prince_craft_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/k8RjfVU/crazy_for_speed_download_uptodown.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/f94cb.pdfIn PDF document text
    • https://rubopawine.weebly.com/uploads/1/3/1/0/131070645/gumafisu_falosibatokoru_bekamazuf_kobemolero.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/153958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_630772fb70184fd1bdce3bbf1c9d80b8.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_db8364ef0acc490ea28a834b0b6a56fb.pdf?index=trueIn 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_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 5212 bytes
SHA-256: d74e4e08b1aabc9b67d19f58d4fdc24022b94157c1aa09f63baefa41d07bcd13
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 11736 bytes
SHA-256: 02f4b31f6e8ce15f34cece562143cf44413fb688c1fae0f2815e1ab69e96653d

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