Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436d6a5f9c6c811…

MALICIOUS

PDF

100.3 KB Created: 2021-01-08 10:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 67d68b36be7624b50dbab4c23f6c6f1f SHA-1: 93626551f93421ad9b448014a699264cd88d84cb SHA-256: 2436d6a5f9c6c8116160a2392edabbc5b18b767a310440e83f3f21a025d74b07
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/aws?utm_term=earth+science+relative+dating+worksheet+answers PDF link annotation
    • https://bameveba.weebly.com/uploads/1/3/4/1/134108569/kesubebarobo.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/d5jjWt9/telugu_movies_2018_list_imdb.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/mupedopudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f95c0a600e74.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/8c7ee4.pdfIn PDF document text
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/fesaguduw_jezamedojifupo_puragelo_lewajap.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/tusosufak.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/wuvepilamamuse/bladestorm_nightmare_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f491dbf-1495-423b-b0e4-73aef3878b7f/wwe_smackdown_here_comes_the_pain.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/debipusemibigama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d72c72c-4c11-43e1-bc78-e55e6803e46b/35101202166.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_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 5372 bytes
SHA-256: f507cfa74d8e2c0782f1737169fc2286e90801008ea40251bb92e71a4c0b22f3
font_01_sfnt_off00015d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D06 11556 bytes
SHA-256: 6618eb9f17fc6484ed7489349af4b863b55a84e9210cbc7a627de44ab2022428

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