Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed0da71ae84d4d2…

MALICIOUS

PDF

80.3 KB Created: 2021-03-12 15:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 882b491e2a6867da31551559f6d0b52e SHA-1: 9c71aaf73868bd91e138439094281c75084b4fa2 SHA-256: 4ed0da71ae84d4d22f0a91290ad29c3c6a55091e8d5ca9b0dd09ae93cba2f40b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection, potentially leveraging embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/123?utm_term=the+curriculum+mapping+planner+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fe91b7d26edc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382420/normal_5fed0ffe7aec3.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/tugubesekigudira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_5ff4bbfb6f825.pdfIn PDF document text
    • http://fishing-rods2.club/pyromancer_dark_souls_1_guidel7dua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5fda4860c5cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416789/normal_601463da6fed3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5ff14621864e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6048fb31e8ef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_6046387684785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60479dc386c09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd1cb3a8de30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6024551ba5305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_603c345733e78.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/8649101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_603b112de372a.pdfIn PDF document text
    • http://nikaold.site/dupegogigaowa9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_6028ed97e1e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5fe1c5a66948a.pdfIn PDF document text
    • http://itgermany.net/51267969896g6irt.pdfIn PDF document text
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/banewuwavubeb_tivezi_sagina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5032 bytes
SHA-256: 20170d5695199c06fa155eea2a30d807e4226302b4fe75fa5395d49a2abd7ad2
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 10780 bytes
SHA-256: 941df759a40a220dc3acb180b390745c5f746940f67fe58add726561627e6c23
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333