Malicious PDF — malware analysis report

Static analysis result for SHA-256 0302c856b9bf931e…

MALICIOUS

PDF

73.5 KB Created: 2021-01-11 08:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d107a4d9859088e00faab28a11001692 SHA-1: 0df3909971efd9adcbced8ff792ca2e2f634ad31 SHA-256: 0302c856b9bf931e0db3bf6d021fba5e2fb671c9e8c3bc65ad5f1852aa3e7d6a
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=spell+check+app PDF link annotation
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/9822bb.pdfIn PDF document text
    • https://site-1225804.mozfiles.com/files/1225804/43925016053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_5fe65910319d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5fddcc690e33b.pdfIn PDF document text
    • https://site-1171107.mozfiles.com/files/1171107/lusiranizinunumewux.pdfIn PDF document text
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/muwedevogi.pdfIn PDF document text
    • https://site-1180295.mozfiles.com/files/1180295/setesozoxonofuduba.pdfIn PDF document text
    • https://site-1172119.mozfiles.com/files/1172119/tenudijipusavifukatifexak.pdfIn PDF document text
    • https://ledekatibawe.weebly.com/uploads/1/3/4/2/134265754/fubivu.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/jalokosabezisu-butawafasegi-bifigolajek.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/Bihific/98583647609.pdfIn PDF document text
    • https://site-1207676.mozfiles.com/files/1207676/kabevedekilodepatabanu.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/strategy_and_tactics_military.pdfIn PDF document text
    • https://vulazijol.weebly.com/uploads/1/3/4/6/134648863/d44dcd7.pdfIn PDF document text
    • https://site-1171407.mozfiles.com/files/1171407/how_to_iron_a_wing_collar_shirt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 4360 bytes
SHA-256: db05f2d6dde307c06d36b1472d6952bc5d50a1b159177b816bafbc9876812a3b
font_01_sfnt_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 10916 bytes
SHA-256: 871c26aaa622a1142399f62d8b0b57bce66ff69f545ef07026a5411e6016c86f
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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