Malicious PDF — malware analysis report

Static analysis result for SHA-256 0156d4417e1d2a06…

MALICIOUS

PDF

89.3 KB Created: 2020-11-20 04:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a459e1699613be0cfc72fdc0aad363e2 SHA-1: d5da2d15aaa221476c77301f1e1b795a1d9c2ee3 SHA-256: 0156d4417e1d2a063519bb692e2ec1c8892f122e558de6c5d86314577f78f29c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two pointing to known malicious redirector infrastructure and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users through embedded links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=pathfinder+empyreal+lords
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f8e52b2ab045.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fb7218d84e0f.pdf
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f876c1b147e8.pdf
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/ruvoma.pdf
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fafd27081b6f.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/b919b1ed8f.pdf
    • https://cdn-cms.f-static.net/uploads/4452865/normal_5f9f382df1896.pdf
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/sapob-welepuxelexu-wesumufore-guvim.pdf
    • https://gilawigegazimo.weebly.com/uploads/1/3/4/5/134520665/8310151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/75cd69d0-56bc-46f4-8737-f278d4c5c5d3/pexado.pdf
    • https://uploads.strikinglycdn.com/files/4f1f5d94-434a-4b51-8ec3-3963caed3f02/vernier_calliper_reading.pdf
    • https://uploads.strikinglycdn.com/files/9379ac56-6ca0-4017-9bae-bd7b98557709/salient_features_of_romantic_age_in.pdf
    • https://uploads.strikinglycdn.com/files/5f3a5ffc-698b-47a7-9247-df350e395a16/vutodawabufasiguma.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011527.bin
c6e4b6c6a9a788d920b27c870c0b556fa2cf35dc9b9d4b0f2d536ce196b3cfe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 5172 bytes
font_01_sfnt_off0001268a.bin
cbb717e77787c4ac5c8c261f55afffbdcd4e4ceecd5374145c5700e63c7d0ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 10408 bytes
font_02_sfnt_off00014a00.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 4324 bytes

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