Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27402811646bd8c…

MALICIOUS

PDF

76.1 KB Created: 2020-11-16 19:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f2e9347cf6ae20ffb80baeedc7e7a2e7 SHA-1: 9a889163c5499d29c1302446e5c4a57a698edb3c SHA-256: d27402811646bd8c30f0a083a1fd21be7aee51baadd98e1bd45ef48bb1fc3331
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'Password-protected archive lure' heuristic indicates a common tactic to bypass security filters by encrypting a payload, which is then decrypted using a password provided within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=cordless%20house%20phones%20with%20answering%20machine PDF link annotation
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://gasutasisewejiv.weebly.com/uploads/1/3/4/4/134403787/4088144.pdfIn PDF document text
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/5695c66a91751.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/74213f.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/xubutejikiwina.pdfIn PDF document text
    • https://sogokuwuze.weebly.com/uploads/1/3/4/5/134500874/2728086.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/566c475588.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/dazovosugev/74410042459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a466a89-be41-4c92-8e3f-9a67cd8df2a6/3306932989.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/26597765532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd8ef87-3c56-419d-91d1-d71931816c73/funodiluv.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_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 5484 bytes
SHA-256: 90c88b463966cab5a0bcc645552f566c96d74162e61ef11b242863fc30074201
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 10600 bytes
SHA-256: aa7b808e7b73307b315579e47a7a98df1bc61a2c662f73f3cb3d2bde764cdca4

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