Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de316de2248a3ac…

MALICIOUS

PDF

76.2 KB Created: 2021-04-04 19:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9a51a0c1cd29946a0301fa360aa875fe SHA-1: cf084fe4a68d94c8115ddd4a38e9ebb260c1eb74 SHA-256: 5de316de2248a3acc4af0c459aa6676089592158adc8e6bd6bc1d7bddbe4d0ec
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 identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to malicious content. The embedded URLs and the PDF structure indicate an attempt to disguise the malicious intent as a story, likely to facilitate phishing or malware distribution.

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/strik?utm_term=os+the+help+based+on+a+true+story PDF link annotation
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/tizurika.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/hbcibge/kefajatezetuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5ff07913e96b9.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/eo0wgfO/wanor.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/CY2cLjh/xevudodenorateroluwukez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_602050bd76bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6036965ad727e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6052abf35f7ab.pdfIn PDF document text
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/girinuxarekokidadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_6000e8a9a282d.pdfIn PDF document text
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/jutugubivun-mesapukedon-podedelovamuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_6032e4f6e2d3e.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/moto_g_3rd_gen_wireless_charging.pdfIn PDF document text
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/nafupumevusa_fumarexoxeseri_bowoxugamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_6068f47ba7f24.pdfIn PDF document text
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/9114924.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/jd8ncif/33233364256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikoliduxa.atwebpages.com/jusowisogiturukavusoku.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5316 bytes
SHA-256: 5ca147b900b5876bac3d2de891c75f965046afd6666c52b17d18affd789e2f50
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10636 bytes
SHA-256: 1b07168915a06c01e555f495ead203f33aa97926316bae170de0a09ca400a690

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