Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1562bbc418cd51d…

MALICIOUS

PDF

68.4 KB Created: 2020-12-02 06:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 240c484b468bf119e197ec68ab55bc22 SHA-1: 644471f3257fda758202c947e06d2248a287c0d5 SHA-256: d1562bbc418cd51dca9d6527028e01433ca5f920c223760c68770d55bfd7c21d
244 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was heavily obfuscated and truncated, preventing a more detailed analysis of its specific lure.

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://gettraff.ru/123?utm_term=nyu+civ+pro+outline In PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/5087612.pdfIn PDF document text
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/7371521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f86fa9db6b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5fbbbcd7a238c.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/6306106.pdfIn PDF document text
    • https://bunemevomuw.weebly.com/uploads/1/3/4/7/134733911/rutafufalek.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/fewabi-xijew-potuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_5fa5c97eea945.pdfIn PDF document text
    • https://babilazumi.weebly.com/uploads/1/3/4/6/134666759/mowugejodibapix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8ab05de4d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_5fb4dcf969baf.pdfIn PDF document text
    • https://miposuxabok.weebly.com/uploads/1/3/4/7/134765548/jepabik-bomoxujelonevu-zimisasavutubo-rowelesavela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/59ccb5cc-cdef-4b16-abb5-b2f4207a9150/45423318947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 4552 bytes
SHA-256: 0cc8de22e2c9b32f1c10e913dade9eb5985b8a9422e50e45512628d78b1ec61f
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 10660 bytes
SHA-256: 62c340f3100c782d8ef891511f4a9481e5a1b9fd66913d5d7e9fa2d00f32201f
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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