Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c1b59c1aabef0e…

MALICIOUS

PDF

75.2 KB Created: 2021-05-29 23:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: be83b6984b1abef980caceb213f0d5fd SHA-1: 232c28d30a10625ac2513e7f66c5ebbe2e83ec4c SHA-256: c4c1b59c1aabef0ef92cb1f8dea03c020437e1de0c36425e3167e9c28e688538
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to malicious content or phishing pages, and the document's structure suggests it's designed to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=passive+forms+of+gerunds+and+infinitives+exercises+with+answers PDF link annotation
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/misivixevetut-jizimogosot.pdfIn PDF document text
    • https://fozidisevuxife.weebly.com/uploads/1/3/4/3/134356050/zurifidifigagob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_601b8b473b3cf.pdfIn PDF document text
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/5dd19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_601cb730ed01c.pdfIn PDF document text
    • https://vuxemirisem.weebly.com/uploads/1/3/1/4/131453034/e193c7.pdfIn PDF document text
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/b5879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_600d0acd90561.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/647dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410207/normal_60249b5216c0b.pdfIn PDF document text
    • https://wuxinafub.weebly.com/uploads/1/3/6/0/136084542/9185746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fe5ee9edd3ac.pdfIn PDF document text
    • https://likivaduzizi.weebly.com/uploads/1/3/4/6/134699319/bapaluxa-perazewam-kureliwebu-fikadadusurew.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/5e70a65fb02a0.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/vidojilukizuda_purugupowapek_dogetufamaparom.pdfIn PDF document text
    • https://wuzakuxiletidu.weebly.com/uploads/1/3/4/3/134322166/nolikixaku.pdfIn PDF document text
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/xifopapikakipa.pdfIn PDF document text
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/6019646.pdfIn PDF document text
    • https://selijexobava.weebly.com/uploads/1/3/1/8/131856120/96d249b0fa87.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/46467fd6-3a25-4714-a85a-6accdf75e9e7/zuzugizaliwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79621f01-e0ed-40c2-a993-69b9530f3944/what_kind_of_oil_does_a_2001_honda_accord_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f3053b-774d-4984-88ab-6d2c9cb1993e/29019705374.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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5624 bytes
SHA-256: 0c87ce64d9ae078ca903afdbd519c8650d6f7bfe50b382c55cfa4cd2550612ea
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10528 bytes
SHA-256: 4a54cbae98439b44a028f7955e5da8dd3515ede8f9d8deb0fd4020b797123beb