Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55f6cc5d5c82327…

MALICIOUS

PDF

94.3 KB Created: 2021-01-01 09:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e401da85ecac8ad9b7f3b6c2b444b53 SHA-1: d041f7ad57975b4333a0851aa997888266919170 SHA-256: c55f6cc5d5c82327bf7d1484ca1c81de18b21e1d235e03c9b4a0d372b6533945
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, 'https://trafffi.ru/123?utm_term=mon%252Ffayette+expressway+public+meeting', is directly embedded and suggests a phishing or malicious redirection attempt. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support the malicious nature of this document, indicating it's likely a phishing or trojan delivery mechanism.

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-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://trafffi.ru/123?utm_term=mon%252Ffayette+expressway+public+meeting
    • https://cdn.sqhk.co/solumapidema/RQeyicT/dalepuvefofuxenepin.pdf
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/61cb531.pdf
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/najuwaranoxobabafel.pdf
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/lutavogizega.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8b0e9d0e-c5d1-4a1e-9b59-916185be2bea/how_much_does_melaleuca_cost_per_month.pdf
    • https://uploads.strikinglycdn.com/files/b9e6830d-a7c1-4df0-8158-5d80f59f4bbd/probability_pitman_ebook.pdf
    • https://uploads.strikinglycdn.com/files/16c38822-16d2-41db-9b42-01cca7e97c79/27758882937.pdf
    • https://s3.amazonaws.com/memul/dell_latitude_7490_manual.pdf
    • https://uploads.strikinglycdn.com/files/fe611e7d-b393-48bc-bb47-260fbc1b73c6/4091624789.pdf
    • https://uploads.strikinglycdn.com/files/247e855c-f880-41e8-8980-d13ac9ecf514/falesemoridil.pdf
    • https://uploads.strikinglycdn.com/files/64f65293-15e8-4a4d-9bca-015294d9c216/howl_and_sophie_flying.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001253a.bin
1dd18aa5ab74c7b13b2e23542a1dc454c6c688f0c5c22a469784fb268b4e5fb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 5660 bytes
font_01_sfnt_off00013893.bin
5ad4525d5a73986c434bab6eb59add0f8f9c3d28cc0f52bc0fec574afb725343
pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10884 bytes
font_02_sfnt_off00015e15.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E15 4324 bytes