Malicious PDF — malware analysis report

Static analysis result for SHA-256 845918b6b3303bdf…

MALICIOUS

PDF

73.0 KB Created: 2021-03-23 17:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 415b67df468382b0f283fd8c7555a25e SHA-1: 2ed4c0c5fb9024cf9034da33e853df6e556b9a27 SHA-256: 845918b6b3303bdff560d1bd9928ef0a89d24fd48daf89fac057ede8b9e9b3d2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. Several heuristics, including ClamAV and an ML classifier, flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites, and the document's structure suggests it's designed to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=endocrine+concept+map+hbs PDF link annotation
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/5241549.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/21cad2eea3.pdfIn PDF document text
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/5836b1a6a1.pdfIn PDF document text
    • http://lejebodaz.22web.org/free_online_hymns_sheet_music.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/8985710.pdfIn PDF document text
    • https://gotowixupin.weebly.com/uploads/1/3/4/3/134393593/f683f.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/mukalegidemofiv_texazitarabeza_dujinorufagona.pdfIn PDF document text
    • https://doboxupa.weebly.com/uploads/1/3/5/4/135401174/geludetigemupuwujun.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/lorarilijav-seveba-marojul-mawepifidol.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/6461848.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/dabef.pdfIn PDF document text
    • http://bimadepunepi.mypressonline.com/technology_used_in_autonomous_cars.pdfIn PDF document text
    • https://tuzakipimuvujuv.weebly.com/uploads/1/3/0/8/130813756/loxetekodemu.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/sony_wireless_headphones_mdr-rf985r_parts.pdfIn PDF document text
    • https://zisetilu.weebly.com/uploads/1/3/1/3/131382786/1110091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/73516049067.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/45865016766.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/tinijidorakejuja.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bollywood_movie_barsaat_2005_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/75117259702.pdfIn PDF document text
    • http://jesegiwazumox.epizy.com/aptitude_questions_and_answers_with_explanation_for_freshers.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5376 bytes
SHA-256: 9a7d9d85e7896efde88adfa5ed369a0d12cba4b7ba91358a92bc6ca2ced671eb
font_01_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 10296 bytes
SHA-256: b192fb4690c41cb566ad0ad0f617eb2dfb6935d34573fc8d0717d0f048d75f82