Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e62bb6730c64bd1…

MALICIOUS

PDF

78.0 KB Created: 2021-02-20 13:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 264d6e571ada11c21b05b1494b99582b SHA-1: 4fedf1fa00c3e6ad7ac95b7f279c20ba3e3ce7e3 SHA-256: 4e62bb6730c64bd153cd2aaa8c95b0dd6bddd01ad41fe5e9bac3338f75b81da5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF documents, likely intended to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

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://jottigo.ru/strik?utm_term=how+many+humans+have+ever+lived+on+the+earth PDF link annotation
    • https://cdn.sqhk.co/nufanusiki/gcDjcW4/diablo_immortal_cancelled_petition.pdfIn PDF document text
    • https://rutuwupu.weebly.com/uploads/1/3/1/3/131378820/dimarubogujexujup.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/gd6ggBW/valiant_hearts_world_war_2.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/repev-wiropokuj-wifuj-nalitesesepum.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/rovidawibime-kurowov-boletes-roget.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/844416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_600bffff56317.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/5737617.pdfIn PDF document text
    • https://sileperu.weebly.com/uploads/1/3/1/4/131406390/3093384.pdfIn PDF document text
    • http://pudumalezedokav.22web.org/frog_dissection_lab_report_33a_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5ff585396fe11.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/a286adee281596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_600e4d048a88c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikumupibo.epizy.com/26186775617.pdfIn PDF document text
    • http://gagisomix.rf.gd/5475354416.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_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 5280 bytes
SHA-256: 1e638b3ed1ba7e4d5896f7b3eace27e0658d5d6a9c8a1de4beb6e52b971961f8
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10872 bytes
SHA-256: 8e8688ad30f989a2f9e10d64d7a9d532b66d94d176a42178509e79360aaabf2d

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