Malicious PDF — malware analysis report

Static analysis result for SHA-256 445b268f4da00d7f…

MALICIOUS

PDF

77.5 KB Created: 2021-01-05 09:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 04e546fc959b5e98116c9fe1af1c9076 SHA-1: d1558fb36eee008b86433d093cfade251cd926e4 SHA-256: 445b268f4da00d7f7b349c8a8b1af2e57dc3ce84f27b68c60d6a51e030a6bf2e
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that redirect users to external sites. One of these URLs, 'https://traffking.ru/123?utm_term=section+19.1+acid-base+theories+answers', is flagged as known malicious infrastructure, indicating a phishing or malware distribution attempt. No scripts were extracted, but the nature of the embedded links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=section+19.1+acid-base+theories+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f877d2491537.pdfIn PDF document text
    • https://jemijibiwozigep.weebly.com/uploads/1/3/4/8/134855884/7326556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5f91f98e206a1.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/gjaFwhg/venexuvigi.pdfIn PDF document text
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/7520911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fe42a2b0a2b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5fc172974154e.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/belalanafepu.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/862336.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/9e75e6b.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/56393de3-c97f-4486-a1eb-4950878fc76a/9555587414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4e0ae4-768f-4597-adba-15453d167d32/gasixozorutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acca0dd0-33b0-4766-8547-f45b1ec14f6f/fojalufakiwedatemowiful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ade10ef-b695-4eb9-b650-974684c795ec/50031315838.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5604 bytes
SHA-256: 93bb397f07ee6057e4ed2e7d6aa8f9e534f19ed03a08e5395df0e6c2946c4f0d
font_01_sfnt_off00010683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10683 10172 bytes
SHA-256: 793c09dfaf500e83a6d74352b12f595a67f1edf8e061c24f460cadd5125f7d90

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