Malicious PDF — malware analysis report

Static analysis result for SHA-256 069e40caab30a37f…

MALICIOUS

PDF

63.4 KB Created: 2021-02-02 05:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8e2badfd11254327531e291b77a116d SHA-1: 550dcd93692d7445ae098771dc27563e3568be54 SHA-256: 069e40caab30a37f74318d4e4b25da6c1f9edc2036578c0cc29bfe7b5aff0ce1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure implies a malicious intent to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/aws?utm_term=balam+pichkari+video++pagalworld.+com PDF link annotation
    • http://tumbochka.space/rs_aggarwal_quantitative_aptitude_download1lxry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_5fd7bb7cea691.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/gygd1hf/45127566632.pdfIn PDF document text
    • http://devlp.design/vejegimiwsxpx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_5fd3184b10120.pdfIn PDF document text
    • http://forkidsshop.online/mastering_with_waves_pluginsenj0j.pdfIn PDF document text
    • http://reduslim-shop.website/laptop_factory_computer_builder_and_maker_gamesfedlb.pdfIn PDF document text
    • http://ryduslim.website/9776426975y7zb9.pdfIn PDF document text
    • http://tiktokhd.design/musical_instruments_dnd_5ek424e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479904/normal_5ffc75e617a2f.pdfIn PDF document text
    • http://idealica-it.website/531376823682xn4q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_60079e239bba2.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
    • http://ramimivojis.rf.gd/moraselefifef.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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 5208 bytes
SHA-256: af2a3e1a6bab248ecd66884a54a4ffac20e5660387701b051a2c7bca5c324ab5
font_01_sfnt_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 10076 bytes
SHA-256: 03d746925896cd7072c74a722c4d02d70e057048ba5c8fbb8460238ddf55704f
font_02_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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