Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd502f0fcc9a60d…

MALICIOUS

PDF

71.6 KB Created: 2020-12-03 13:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d534e92340409ef041077b55102d2089 SHA-1: 19e3fde984ddd9cbd0d819fd56e372f511119396 SHA-256: 1bd502f0fcc9a60dd2762da044b791f1542ef319f63d48a2d7ab63cea43695a9
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with heuristics indicating a link farm designed to redirect users to malicious sites. One critical heuristic specifically flagged links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware delivery.

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://cctraff.ru/strik?utm_term=kinh+cam+on In PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/8451774.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/78d947c8e70c4.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/letoj.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fb6ea1e28c58.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/faxesufokuvalibiro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb490617-d985-437a-b3e0-42769896898a/rigexotupejokunoriwudes.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/finizipotawirinaler.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d673f75b16643cb8dc7/1606372712315/hot_cross_buns_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/stanley_backpack_sprayer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee9155d-a0fb-4f0f-bc2d-134cb4c24c95/vifatibonuxorulisijus.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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 4704 bytes
SHA-256: 46e6bcd4feac1f03b11a8acd722b8d9b45d1f1eb3535051390e1bf441288a478
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 10332 bytes
SHA-256: 9ee973425dd50a33efdb006b3884909dee94ce10dec40516c9e84c8a9c1c920a

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