Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8280b13f054cecb…

MALICIOUS

PDF

78.5 KB Created: 2020-11-10 12:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bead7d96f5755ec33a97d61d691fda56 SHA-1: d7f760bf336414fa64851a6ccbd105a046edce8a SHA-256: d8280b13f054cecb8f1e445e21eb139ea9f152450c4541eac1ce72a268465c2d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and specifically includes a URL designed to mimic a search result for a technical topic. This suggests a phishing or SEO poisoning attack aimed at redirecting users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/strik?keyword=data+structures+and+algorithms+in+java+pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8c1f9ae88bb.pdf
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8c2606847d7.pdf
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/wilononuremorev_surawolumizi_pikenolugov_juwijisa.pdf
    • https://mugekezozo.weebly.com/uploads/1/3/1/6/131636766/vodemup-tapitavuzotop-dowosa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68b5a036-e832-44a7-a361-a14894e353ce/19052235075.pdf
    • https://s3.amazonaws.com/zafaronivaj/bachelor_thesis_psychology.pdf
    • https://s3.amazonaws.com/sifawekujiki/ninig.pdf
    • https://s3.amazonaws.com/kikunojulejuj/arizona_library_association_conference_2019.pdf
    • https://s3.amazonaws.com/desekusoxi/apc_back-ups_xs_1500_manual.pdf
    • https://uploads.strikinglycdn.com/files/06d40634-f4d3-4f2b-93af-dc01c7e042b9/personal_behavior_change_examples.pdf
    • https://uploads.strikinglycdn.com/files/82b61140-213a-4681-a6fa-ea961df352c9/denejesune.pdf
    • https://s3.amazonaws.com/susopuzupure/tisesozamoborenomofi.pdf
    • https://s3.amazonaws.com/tomamujuf/rikekabiwiv.pdf
    • https://uploads.strikinglycdn.com/files/3e0b315b-b203-4b46-9534-e4cc0ec8b322/68070691820.pdf
    • https://s3.amazonaws.com/moxekibupuru/larosiluzigotanegixuparex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06c.bin
fd2b619181415c45f40e129a0ce14c62a385e63aceeb1531fc0f07c11312f606
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 5704 bytes
font_01_sfnt_off000103c1.bin
72ec64c02c380d749a24180a1eb507c4da1d490398f78a08bdc3c7e00f0ca051
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 11504 bytes