Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b40fc6f5dd1d88…

MALICIOUS

PDF

66.3 KB Created: 2020-11-25 09:00:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf85f9bde7d1acce391190fe04cbbb7 SHA-1: d476524102b1ef3889b6441e0440f3c6429cc50c SHA-256: 03b40fc6f5dd1d8812d380512f3c143065649d4513f15cd0144179177daf74d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. One of the extracted URLs, 'https://trafficel.ru/strik?utm_term=game+clicker+android', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=game+clicker+android
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/2183803.pdf
    • https://rinalodejivew.weebly.com/uploads/1/3/4/3/134383373/gufomoziruwasami.pdf
    • https://pajudeva.weebly.com/uploads/1/3/4/6/134657304/nizobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/megulu/difobob.pdf
    • https://uploads.strikinglycdn.com/files/6007b26b-3658-4091-8fb5-b0cd5b57089f/lemukukorimigixuv.pdf
    • https://uploads.strikinglycdn.com/files/290b0771-4828-4b55-baf5-4877f1af6957/tribunal_de_la_acordada.pdf
    • https://uploads.strikinglycdn.com/files/e0ad09be-0b77-4275-bdb9-1a58073fb00c/47467131584.pdf
    • https://s3.amazonaws.com/varolexexus/perfect_chemistry_book.pdf
    • https://uploads.strikinglycdn.com/files/f04f3cd7-ce59-447a-afd7-78906d4b13c9/81765957078.pdf
    • https://uploads.strikinglycdn.com/files/52d69a83-3de8-45a8-a892-cb1864855847/belesikenoz.pdf
    • https://uploads.strikinglycdn.com/files/c23c92be-8e0f-41c1-81a4-601aedc032d8/on_3_turbo_kit_silverado.pdf
    • https://uploads.strikinglycdn.com/files/c7439855-5202-44bd-81fb-3b4f048851af/brahma_sutras_in_telugu.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_off0000c94c.bin
b61a2b67708074f35d8769efe6dfca904ec4868228b4bed98c9f4c9b9cae48b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 5000 bytes
font_01_sfnt_off0000da3c.bin
22a3ddcdbe0fa54d2bc29c0ab69886f3eb9d5cd28452f81bdef1200ab3e3a0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 10104 bytes