Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c6444438893840…

MALICIOUS

PDF

69.7 KB Created: 2021-04-21 17:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4665d413691eac0c8b94dffdeb4ca898 SHA-1: dd1bf30de7002cfb57aeccab8686585da3f61270 SHA-256: a6c6444438893840aefd85f04cd28e18adce1c6a7938215a2a6d5922438454ed
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=char+broil+2+burner+infrared+grill+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462974/normal_60123d6783f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389107/normal_6063f8007c9f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_603a84d0323ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_601261e67564a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_600a87f6aa7b0.pdfIn PDF document text
    • http://bisewilorilamej.sportsontheweb.net/mupigosimegufadilogebos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5fec9cade9e35.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/10863505746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_606e304d2636f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6019929bd6791.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/d8b8b98c-2cf8-4974-8ebd-97f1abffd46a/sat_practice_test_khan_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c81061d-f08b-437d-baf0-9acfbec1bdb4/80564191427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26acfac6-9347-44af-8449-f5e1de28c574/vitivinogakigenimos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955e388e-39cb-481f-b77b-410fd7d46671/77134478605.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_38c61d7fd7874683be72abd7ab601a77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/wiwaxofusunojupoxasigife.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/81618121047.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_1839ab9e5cbf4bfebca801b6a5cd8891.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee24f29b-8707-4eb4-951f-ab10eb6bb68b/98185875916.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/lippincott_nursing_drug_guide_2017.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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 5480 bytes
SHA-256: 4beb41f57e9078e3876dd3d71a6f00afc39dd241e86e94089d6ed2b735cd1d49
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 11276 bytes
SHA-256: 767787a5ff2bd252b0ad24755037271b25aedc4ef3874cedeb0535938dfe0159