Malicious PDF — malware analysis report

Static analysis result for SHA-256 306712e18197d534…

MALICIOUS

PDF

71.4 KB Created: 2020-12-20 03:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 30321e44b1b71875eb2f2a68f56a1533 SHA-1: e8ae29cc0c2cc876105ac6538fd95b98d6672a00 SHA-256: 306712e18197d5341afe236c9e467a45d633e362255d723fceff29af9d0b7fe4
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which are hosted on disposable domains and redirect to known malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to lure users to malicious sites.

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://gettraff.ru/123?utm_term=don+kirshner+rock+concert+episode+guide In PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/4162665.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/14fb87b2412.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/bitelalenubi_vobotalevudobo_boken_mavesow.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/pojifakana.pdfIn PDF document text
    • https://liforofejot.weebly.com/uploads/1/3/4/3/134350560/7482984.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/zexujaju.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/jelubono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408323/normal_5f97a31469c57.pdfIn PDF document text
    • https://baginemesurewis.weebly.com/uploads/1/3/1/3/131380932/9d405d8103b8812.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/fadapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5f8b7d263cdb2.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/muruma-xalumesiw-resusatoregu.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/a9571899-1824-4b6f-8f66-7b81c445b737/oligopol_piyasa_modelleri.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5156 bytes
SHA-256: 1db7b0ab8d18783a942642e761f2580239a635cd43e922e976d53598443926b1
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 11236 bytes
SHA-256: 2cdeccf1817f0b2d99ab9209a1665d82e02b0e3fb22d1c8c6514fdd29a5bcd9d

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