Malicious PDF — malware analysis report

Static analysis result for SHA-256 9220b66004f1b258…

MALICIOUS

PDF

80.0 KB Created: 2021-02-25 23:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2eca818a74463ec83b20f741f3946f3 SHA-1: f47526f1db96a711012af080ab16372adf6ba16e SHA-256: 9220b66004f1b2587194044af7af9f7f7e50b9b052947e35118c8fbb9bcdadde
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support the malicious nature of this file.

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=does+kindle+have+harry+potter+books PDF link annotation
    • https://cdn.sqhk.co/venitalobeni/dWifmgi/digi_easy_payment_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/g736zgh/83692586546.pdfIn PDF document text
    • http://alisaborodaenko.design/lotoze6x6ag.pdfIn PDF document text
    • http://fsbsiod.com/goblin_fury_of_the_smallx5jjq.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/nasekabevo.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/a047d28.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/ckjbVeM/zobim.pdfIn PDF document text
    • http://crubr.space/wixofopufovulamuwiwadevufg6vkt.pdfIn PDF document text
    • http://hackins.site/33261991249r5voh.pdfIn PDF document text
    • http://poradoit1.site/3346082958288xtv.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/vujokogituzowa.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/nebatomarojuj.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/vokom.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/xaH5hcU/20661107800.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/bcd87e1.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/h8asjah/kulakapogagepeve.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/frheTDH/slow_rock_songs_free_download_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/hfhhAc3/72639684723.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/dhjjhge/65160363267.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/dosek.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://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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 5200 bytes
SHA-256: 140d6e8a7dcb6643a4cdd9be2925168b5986a8ec43e2cc7fb6b1e4f97fc680ee
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10208 bytes
SHA-256: fda1ee8b4078fe4a4aab274b62acf467697255d73d0f2595740a551bbf6cd350
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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