Malicious PDF — malware analysis report

Static analysis result for SHA-256 c334df23fd58f826…

MALICIOUS

PDF

98.7 KB Created: 2021-02-11 16:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3cab523447eeaf0cd9d3bbc0b412b70b SHA-1: f66d1815746815df330162b7e79ba1e4128f4571 SHA-256: c334df23fd58f826e1272669518dec7f1aa9c3f410a9e9aec9b46742dcae7c37
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'large scale system change' and 'wkhtmltopdf', hinting at a deceptive lure. The presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content.

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://crophysi.ru/123?utm_term=large+scale+system+change PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5ffb3bc6e759a.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/fogozelesezaj-galosudibig-zajoz-zakosuwuvu.pdfIn PDF document text
    • https://lolujimibo.weebly.com/uploads/1/3/0/7/130740441/2cc70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5fd7b9e7b2c82.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/hcIyidu/ghayal_once_again_full_movie_free_download_720p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369524/normal_5feca1c4d03da.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jejh7ie/55157872920.pdfIn PDF document text
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/sojejagowixesufuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fed1367d6aa0.pdfIn PDF document text
    • https://cdn.sqhk.co/vawikepaf/Iibzgx3/rewodi.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/hiisjhC/razofepofekijigagewuren.pdfIn PDF document text
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/5317443.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/agjbgge/mediaf_re_apk_download_gb_whatsapp.pdfIn PDF document text
    • https://mibuvenatevuwo.weebly.com/uploads/1/3/4/6/134607329/4343596.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/LTzjfhd/gokafuwe.pdfIn PDF document text
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/sobeburego.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/pokixovuxik/43057332787.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E1 5256 bytes
SHA-256: bd58845080264671ab5ebeb424d76fbd4355a9af77a06c900069008287404820
font_01_sfnt_off000159a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A1 10660 bytes
SHA-256: d660a75d4a7d4af4f56bfaae6439211aa48b5d0563478a861aa235309427c7b4

Open this report in the interactive analyzer, or submit your own file for analysis.