Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a6d48d52b26a7a…

MALICIOUS

PDF

59.2 KB Created: 2020-11-19 07:10:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6450849cf6b32c941add26a13626bf9a SHA-1: 65eeb5599bd9cdcf555fbba88de65e62d4fd1db6 SHA-256: b4a6d48d52b26a7ab867d195020979d18d19362e67b6b26e884292e758adc533
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, including a known malicious redirector at 'traffking.ru'. The heuristic firings indicate it is a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, appears to contain text related to translation, likely a lure to disguise the malicious intent of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/123?utm_term=paperas+en+ingles+traduccion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fa20661904fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8ac875bd14e.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/81c92d6a663bf0c.pdfIn PDF document text
    • https://fowaluta.weebly.com/uploads/1/3/4/4/134488886/butofaboravubeb-towikodizuv-debudumo.pdfIn PDF document text
    • https://poxozebirineba.weebly.com/uploads/1/3/4/4/134447173/3a5ca5849d8976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5fa0571184fb7.pdfIn PDF document text
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/jawogazanufekaga.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/9e062a0.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/e9da25cb761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8a2138c29ed.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/dc2bb4de-02b6-4e48-a4da-29863ed02ca5/free_printable_ged_practice_test_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2534b8-0f81-4a2f-96cd-8863f9467d0d/74422870465.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/basketball_games_on_unblocked_76.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/ifile_cracked_apk.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_off0000aa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5B 5244 bytes
SHA-256: 5f122e1756a82484bef74b03b3c52fbc1c67e2902df7d054499982b4d328b574
font_01_sfnt_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 10536 bytes
SHA-256: 766084edf740453f4a32d3f91f2ca496978de8fa925ea2ecd38d8de3ca0fd070

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