Malicious PDF — malware analysis report

Static analysis result for SHA-256 470c5c7ef9c6f2e9…

MALICIOUS

PDF

74.9 KB Created: 2020-11-22 16:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: abc522a61e8bc721615ab409f4cac3f9 SHA-1: d55b55c647852bbca7e7405de96c92997cdcb599 SHA-256: 470c5c7ef9c6f2e91e87571a42434cf8bd1019e1e6167ee7d203432514ac14d2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be directing users to external, potentially malicious, content through a large number of embedded links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=jabsco+manual+marine+toilet+troubleshooting In PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wizefulelunibif.pdfIn PDF document text
    • https://fobolobal.weebly.com/uploads/1/3/4/3/134317950/4ec9e23f5bdff8.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/2516406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5fa0289ba0df3.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/rufalafa-vules.pdfIn PDF document text
    • https://ruwusugotalub.weebly.com/uploads/1/3/4/6/134690364/487212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8eb2ae2a24c.pdfIn PDF document text
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/379440.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/wukara/sign_language_abc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f903b5-1c99-44f6-94b7-37cf7410f241/96932024817.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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5340 bytes
SHA-256: 78afd765e5e414d6df1791af35fe6bb45ce11062bbfa3166216240b16c430f96
font_01_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10068 bytes
SHA-256: cac3a1ecde837cfee11c6b86b2806dc8636fbb98dd1de1516ac67e9296c3648c