Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe9cecc8c6b2bc7…

MALICIOUS

PDF

84.1 KB Created: 2021-03-28 23:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 553c7f1a585a05afc77417905877b6e3 SHA-1: 203414f842797b17373087d27ae2d8eee6d72343 SHA-256: abe9cecc8c6b2bc75f9955c471a341d4cac6b78b2545c1760cbbf24ed4deaf16
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary external URI, 'https://ponafet.ru/123?utm_term=aptitude+questions+in+tamil', indicates a lure related to aptitude questions in Tamil. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/123?utm_term=aptitude+questions+in+tamil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fe824bda20f2.pdfIn PDF document text
    • https://libonatelizipo.weebly.com/uploads/1/3/5/3/135326144/begutifaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_5fdb81142cfc7.pdfIn PDF document text
    • http://jasavutarapif.22web.org/refivurasonaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_601f71ebd6d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_6051634e43820.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/810598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_601609669f742.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/niresuvivarowuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_604eff97ada68.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/282362.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450514/normal_5feea092147e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/18833095513.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_85b8b0da3add445993ed282e457dd7aa.pdf?index=trueIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_5ded2899b407460c9c1b819b7f819259.pdf?index=trueIn PDF document text
    • http://wupenokisu.epizy.com/8546420397.pdfIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_e0b70fbd095e4bc691ddc9fb37859e6e.pdf?index=trueIn PDF document text
    • http://resisimokopi.epizy.com/auto_format_visual_studio_c.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_730acccbd26747bbb9f0bba368f5c1ec.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_a7dc02469c6b4e5e8c72d2d62ec1a785.pdf?index=trueIn PDF document text
    • http://robopawize.epizy.com/latitude_e5400_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/tomolerebalud.pdfIn PDF document text
    • http://voxaxos.rf.gd/fundamentals_of_project_planning_and_management_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/68725923253.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_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 5124 bytes
SHA-256: 8406498864e5923e572c480f17919a34bd37c069dc30c68eb18af30ddb6ddcc4
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 12608 bytes
SHA-256: ea9f10d91e0e6d18f07d58bb9a507e71568796e82413f7cd00278b93d37c8935
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 11264 bytes
SHA-256: bee8567adb8eed74f0482958bcb03de1e2650a8369b5b9f1b22d18ce0ee7ee41

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