Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d73e972bce1166…

MALICIOUS

PDF

71.9 KB Created: 2021-02-18 03:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 037093ecb70258bf25d22b63cb64282c SHA-1: 649112fca30be7a5ed3fa6cf93844ffa754f6478 SHA-256: f4d73e972bce11663e306c449ad373ccc3e930ef58e5ac41e4e44c5d640f3957
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains or link farms, suggesting an effort to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on driving traffic to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=tissot+t-touch+expert+solar+battery PDF link annotation
    • https://cdn.sqhk.co/medujebukoma/iBuZRjh/88397293309.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/f7gjQib/54353029604.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/dojuta.pdfIn PDF document text
    • http://znatural.space/break_up_hd_imagesp4f6x.pdfIn PDF document text
    • http://siteznakomstv69.space/77593748278v6vel.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/1yNYlhd/59308468809.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/whbghyo/63257384342.pdfIn PDF document text
    • https://watibovogop.weebly.com/uploads/1/3/4/8/134876481/9494518.pdfIn PDF document text
    • http://puwisagoki.22web.org/90975864618.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/matasov_faxuw_bofuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/GhthdYF/71835389473.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/Jhj8JBr/spinner_chaos_battle_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/evshdkm/47356425647.pdfIn PDF document text
    • http://shoop-fm.ru/71031478038y67ty.pdfIn PDF document text
    • http://jukekabotika.22web.org/96075481690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikikozazilut.rf.gd/moxozufo.pdfIn PDF document text
    • http://pamapubosozule.epizy.com/arithmetic_and_geometric_sequences_worksheet_multiple_choice.pdfIn PDF document text
    • http://jipawivenuzinu.rf.gd/70693391515.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 5312 bytes
SHA-256: 5ee0e352ba4df6cc95e8bff3d4d3ff69e066f8cacaeecb7decc7951e5657b41c
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10584 bytes
SHA-256: b9ba105ba8354d3ae483be9340183854c3c6466fe91be1f9e090b00b55d750b7

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