Malicious PDF — malware analysis report

Static analysis result for SHA-256 3156db78e4fc5ca0…

MALICIOUS

PDF

74.1 KB Created: 2021-01-10 07:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5af858295d094123b4eb2642edf4c0ca SHA-1: 83e857ab7263f9cff665de98408aaf7a8d43acaf SHA-256: 3156db78e4fc5ca0068a5c69c8e5610ad6878792ceabc367bbbb842ca4b61140
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=inverse+converse+contrapositive+statements PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fb00cd65bdda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5ffa860827d8c.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/2a1b356a6.pdfIn PDF document text
    • https://damupese.weebly.com/uploads/1/3/4/4/134492451/2444244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5faee0524204c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424692/normal_5fc5279e3b0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8ff149c7f43.pdfIn PDF document text
    • https://site-1193936.mozfiles.com/files/1193936/tatazonezirafex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5fc6da9e9d9c4.pdfIn PDF document text
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/472817.pdfIn PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/gilofexekipenit_sogijukivon_bekitobafokifub_duwekezejame.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/9eaf88c0f060294.pdfIn PDF document text
    • https://site-1175129.mozfiles.com/files/1175129/kexigidokusaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8ee7d0565ad.pdfIn PDF document text
    • https://site-1178449.mozfiles.com/files/1178449/police_officer_killed_in_st_louis_video.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://s3.amazonaws.com/dutimajizowa/vesinanit.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/cds_form_date_2020.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_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 4832 bytes
SHA-256: 16216825a70ffd3d1688320ef2a0226c4778f13afe9fc0d9b3c4da70ecfdcf23
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 10564 bytes
SHA-256: 96c2953e15880ce1d79a5010348457a7f755b8d4fb7b64e309d35fda661b5555
font_02_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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