Malicious PDF — malware analysis report

Static analysis result for SHA-256 52022dfadd7f7fb5…

MALICIOUS

PDF

72.0 KB Created: 2021-02-20 19:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 70a78e5c5ec0ffe2137b6b3a7bf9e165 SHA-1: d060d309ed0bebddab9aac0be58a7f73f298c2bd SHA-256: 52022dfadd7f7fb593c682edfe4cfae0e419986f56afff850034b39999525084
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 trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'positive thinking books best sellers' and metadata from wkhtmltopdf, indicating a potential lure for users seeking specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=positive+thinking+books+best+sellers PDF link annotation
    • https://tedumevoseviman.weebly.com/uploads/1/3/5/3/135311532/mowesojo.pdfIn PDF document text
    • http://potolkilife.ru/chrysler_sebring_2006_repair_manualwwv2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ffececff3bc5.pdfIn PDF document text
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/dopuzawe-kesixoxebo-tisifami.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/sosujaxerefamivapi.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/8fa528902.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/981fbd568769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_6024b8831c45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_602f82d6d0425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5fe284812d72e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujanozo/agadbam_marathi_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/why_is_my_first_alert_blinking_red.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/wafikomefeti.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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 5004 bytes
SHA-256: 7eb00ed040e37ab1a9a5110adf8d41a48643d0acf51bc1e8a57f28b6d3823422
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10124 bytes
SHA-256: d5f3d98974edb16dc2c38ba1987b9784d405cb4901d511b57a09fce3f125d66e

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