Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a01542c8e2d31e7…

MALICIOUS

PDF

65.8 KB Created: 2021-02-24 01:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: da29d63ffb76f50e35bfa956b8c464d3 SHA-1: d20ee65f6670432d3da167265ee66357eb6238f1 SHA-256: 5a01542c8e2d31e7a1f364808b6c33c2b4ef733f49028b76cd1bfd0e208d463c
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The embedded content, though heavily obfuscated, appears to be part of a lure, with the primary function being to redirect users to a network of linked PDFs hosted on disposable domains. This suggests a campaign focused on SEO manipulation or distributing further malicious payloads.

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
  • 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://yafferge.ru/123?utm_term=how+to+open+ipod+nano+3rd+gen In PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/c1a5886c34.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/3080181.pdfIn PDF document text
    • http://mail-autoscout24.net/dark_souls_mildredhwztc.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/abb9ec48fa.pdfIn PDF document text
    • http://lady-bug.club/63851766209xkhwe.pdfIn PDF document text
    • https://vasaradafivoza.weebly.com/uploads/1/3/6/0/136048391/6858602.pdfIn PDF document text
    • https://nojiwikimina.weebly.com/uploads/1/3/5/3/135315372/nubukikene.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/3887911.pdfIn PDF document text
    • http://ryukzak.digital/nordictrack_a2105_manual227xs.pdfIn PDF document text
    • https://veponigizut.weebly.com/uploads/1/3/0/9/130969631/84272101ca8c76e.pdfIn PDF document text
    • https://zefulesemed.weebly.com/uploads/1/3/6/0/136021217/babe3e5b.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/liteduma.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/ishmael_by_daniel_quinn_quotesd8460.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC376 5132 bytes
SHA-256: 9a204fbde46219ba0c79f0755d4d62441ca75cd9b16376e46d74cb48de23f305
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10976 bytes
SHA-256: 135858b703e4b12cb19e5168df93b0767df316d35e4659ee72d0192dbebc04f5

Open this report in the interactive analyzer, or submit your own file for analysis.