Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cde2d86cd9a9375…

MALICIOUS

PDF

74.4 KB Created: 2021-02-20 07:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9b1c24141ed41ad14f1abac7e1b0c089 SHA-1: d2a98ba4c525adff6402207bd187c6d1dd797731 SHA-256: 4cde2d86cd9a93756e798d2c3b2bbbe33360d7a956f83f9088a80b11293b906c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_LINK_FARM indicates a high volume of links, suggesting a potential for SEO manipulation or distribution of further malicious content. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://seumenha.ru/strik?utm_term=in+the+heights+original+cast+broadway PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fe29c356c6fc.pdfIn PDF document text
    • http://xitnet.fun/what_are_the_18_prophetic_books_of_the_biblepvshq.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/8022816.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/kogesavuzaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/UNiehfl/dusolovixomona.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/hd6kzct/esp_tractor_pull_schedule_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_601958fc69629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_6011a393d2b76.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/97bb0fe8.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/mjdTIhi/idea_mobile_recharge_offers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/jigfjft/kpop_piano_bts_tiles_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daforewepon.epizy.com/channel_7_abc_news_reporters.pdfIn PDF document text
    • http://xifusejikudit.rf.gd/33771583809.pdfIn PDF document text
    • http://vololotiwu.rf.gd/5172116915.pdfIn PDF document text
    • http://torasimi.rf.gd/73836907074.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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5472 bytes
SHA-256: 92e21b121f079568148af24206112e0ada109d8234ed92209b557e8b3f237e4e
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 11336 bytes
SHA-256: 3764121c24074eaae52b8b6b8bce5e0598b9a76a118bff1c7e2617ea42ebf99d

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