Malicious PDF — malware analysis report

Static analysis result for SHA-256 932f1fe93fc7acba…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 07:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d09878bf3c3a34dd7b28bd094259e2 SHA-1: 154c1923d887b7e7c96091a588f0f00eb1b4e8ab SHA-256: 932f1fe93fc7acba6eedca0c2194b2d9c59f50b9ad3f095e1e8ece16c10d71e4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL 'https://dafemum.ru/123?utm_term=video+er+for+iphone+7+free' is likely part of this scheme, aiming to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dafemum.ru/123?utm_term=video+er+for+iphone+7+free
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/seruwisi-zivofobune-gezorujateduwa-xobegujib.pdf
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/2925632.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fff5fabc109e.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_600b3f857e18f.pdf
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/4975adf.pdf
    • https://nasuxixogidipan.weebly.com/uploads/1/3/4/7/134701521/9564aac.pdf
    • https://cdn.sqhk.co/temokika/tiiYjgW/jopufodezojoka.pdf
    • http://jivusibofonefud.mygamesonline.org/21999350180.pdf
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/565188.pdf
    • http://fupomogusi.22web.org/22728821345.pdf
    • https://cdn.sqhk.co/xuxofidipo/agjCgcx/italian_radio_station.pdf
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5ffe5aa89054f.pdf
    • https://revunipaletofux.weebly.com/uploads/1/3/0/8/130874393/4391806.pdf
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/f24a728f6f.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601e81909d515.pdf
    • https://static.s123-cdn-static.com/uploads/4425909/normal_6008c4719fc97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://favuzokusom.rf.gd/froggy_goes_to_school_guided_reading_level.pdf
    • http://bumurulepowele.myartsonline.com/what_do_i_need_for_a_real_id_mn.pdf
    • http://fikelamizogu.myartsonline.com/how_to_tune_a_mikuni_carburetor.pdf
    • http://xolavozezimodan.onlinewebshop.net/relation_between_gdp_and_national_income.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed09.bin
5d685884df7aa613df42a8cc4f6b854c5606de5d65b7d636ce2ed6a17461e130		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 4460 bytes
font_01_sfnt_off0000fc20.bin
e927d85bc276f242539ea9e7e610115fd9ba568f9e27551f969bf3da159544e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10692 bytes
font_02_sfnt_off000120be.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 4324 bytes

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