Malicious PDF — malware analysis report

Static analysis result for SHA-256 89218776e7eda6f7…

MALICIOUS

PDF

79.0 KB Created: 2020-12-25 21:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ddb0f6f653ffd06f097ed6fc56457998 SHA-1: 8a1e6f41f6c5282578a8a965ad462ee3d16fea6b SHA-256: 89218776e7eda6f7efc15fbf28603b46b379bae59bb445cca915dc84180cde85
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no direct instructions or lures are readable. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary function is to redirect users to potentially harmful external sites.

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://traffnew.ru/strik?utm_term=mix+master+apps+for+ios PDF link annotation
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/6366055.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/5a6d012bafb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414691/normal_5fc27e4b7f2d1.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/Ekjbcjb/kebetujeledibukiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/hhgDjjB/fikusokedudunavogifajur.pdfIn PDF document text
    • https://gikusevenax.weebly.com/uploads/1/3/4/5/134529244/9667691.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/xavos.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/ljbjbgd/vitimikaporidolebutovu.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/eb2008374e.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/5197433.pdfIn PDF document text
    • https://cdn.sqhk.co/pujunuzivas/gfhjfhf/conquest_synonym_word.pdfIn PDF document text
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/2e7f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/224f1fc9-4765-4dd8-9756-95d2b06a3442/zusifeluxavilavuguw.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_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 5088 bytes
SHA-256: 1fa99c532bbce0dff968b3061db0f6717c763208f4227bc602d3484b6ad75fc0
font_01_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 10960 bytes
SHA-256: de01773d772d3d770d92c512c5ffc402fb678d8356e439a3a88f27046ee41370

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