Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff30cfa8bdc13cbd…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 11:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fec342fcb4fdb77785b84410a0043375 SHA-1: 1135d95841621f1e3f83c9b642b404bfdd5f80b6 SHA-256: ff30cfa8bdc13cbdc0fe5d7cff171401543ee55dc7f0299fb40478a452822b4f
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external links pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=day+by+day+armageddon+grey+fox+deutsch PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/TOOrCZ2/who_else_died_in_it_chapter_2.pdfIn PDF document text
    • http://kudijajipiwi.iblogger.org/15443038244.pdfIn PDF document text
    • http://bozidik.22web.org/microbiologia_clinica_altamar.pdfIn PDF document text
    • http://zuxuwof.iblogger.org/3269580326.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/3367292.pdfIn PDF document text
    • https://pepukuvem.weebly.com/uploads/1/3/0/9/130969690/bujaz.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/cjffGjj/us_president_debate_2020_dates.pdfIn PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/fupiwu.pdfIn PDF document text
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/b363748c205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_2258f5f7da0544beab7a9a4fa3b3a763.pdf?index=trueIn PDF document text
    • http://zakuvusebaj.epizy.com/dopere.pdfIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_3c9938bd30684b3aa85d999636e7cd31.pdf?index=trueIn PDF document text
    • http://zujawuka.epizy.com/60383075253.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_b7e3faeaed424e39ba98f198a263d8e2.pdf?index=trueIn PDF document text
    • http://sosibozipez.rf.gd/definicion_de_acromegalia.pdfIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_84bae4f8d58647b6bbd9295687c6667c.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_f43e3ba1af43428cbd89c7e4f9807a92.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_816b74ef350643e29da36e3572199f9f.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_a7aa5298f3b54df8aaab8394cb62640c.pdf?index=trueIn PDF document text
    • http://wijetifosoxi.epizy.com/youtube_aprender_ingles_con_canciones_subtituladas.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 5712 bytes
SHA-256: 839c487240d3475e7cc47e4290e4801f5dc93846b991c636aa74140f0181e006
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 11928 bytes
SHA-256: 5cda28e67e30e8f98e7bbb9cb78a47c8a2d142a32d53985d9aec7123fb7de007