Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c662ae44255c96b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 10:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 110ca7067b1e98ca921557915186dac2 SHA-1: 88f5da41291a1ff5a303be270459a081296d5ed2 SHA-256: 7c662ae44255c96b8f52d0b40ebb425f475d7ecc8198062ae6c24c1b2a7e7690
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, appears to be part of a lure to drive traffic to these malicious URLs. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=what+does+the+term+pecha+kucha+mean PDF link annotation
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/risivotovevow-wobovi-wefikoseko.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/degelav.pdfIn PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/bffa1e5dc85f84b.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/1023518.pdfIn PDF document text
    • https://bafipiwefewojex.weebly.com/uploads/1/3/4/5/134576197/bumunogodurer.pdfIn PDF document text
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/7c1d2798b9a616.pdfIn PDF document text
    • https://pivewunakunajuv.weebly.com/uploads/1/3/4/7/134770464/4695496.pdfIn PDF document text
    • https://kosemopadil.weebly.com/uploads/1/3/4/6/134669244/bevit-subafovoneba-tovesu-vodiwitalefe.pdfIn PDF document text
    • https://lexaxaverewazud.weebly.com/uploads/1/3/1/3/131381910/bf62ce8644.pdfIn PDF document text
    • http://newonesitel.22web.org/48306623358.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/dedazebunuvimu-faxuguxel.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/tipoxajonaja.pdfIn PDF document text
    • http://vopibuxipem.22web.org/crayons_design_template_powerpoint.pdfIn PDF document text
    • https://tulugawaluga.weebly.com/uploads/1/3/0/9/130969515/misoxugusuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakawarinuku.epizy.com/antivirus_za_mobitel_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcc8bd2-f41c-47f6-9493-892f4bf8046e/maberi.pdfIn PDF document text
    • http://zixupikitudid.epizy.com/zifidorofo.pdfIn PDF document text
    • http://tanebani.epizy.com/rafaw.pdfIn PDF document text
    • http://bejumajiluwod.rf.gd/29494621558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79284f33-50a7-4b03-8fae-86f25d343da6/fukizuraditeragulibep.pdfIn PDF document text
    • http://kujodobiwug.rf.gd/how_to_use_brackets_in_order_of_operations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe19140-7335-4f19-8093-5289ddb34c85/82891711114.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_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 5356 bytes
SHA-256: 584d118569324739347b07f7fb0df220a363725b040c1e56ad1f00c8e2b4bbf2
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 10524 bytes
SHA-256: 2027cc7f388e94b41e4972d383e50cf562062c938261a7f72a717bf1cd92792e