Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2656c4528168a2…

MALICIOUS

PDF

74.9 KB Created: 2020-12-27 07:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: df1eac7867fe7a94205cacfafdf08d6a SHA-1: 786f06d33fe1291da682ae51f19c4bbffbf1c560 SHA-256: dd2656c4528168a25eebab1fb7cba75bc7c4a0a6ee0a7440f55e77c30f8de8b1
126 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references "Halloween worksheets for 8th graders" as a lure. Numerous embedded URLs, including one pointing to "trafffe.ru", are present, suggesting the document's primary purpose is to redirect users to malicious sites. No scripts were extracted from this sample.

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://trafffe.ru/aws?utm_term=halloween+worksheets+for+8th+graders PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403951/normal_5f9a7e1a9201d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_5fba7b3e058d4.pdfIn PDF document text
    • https://kuvomudoriri.weebly.com/uploads/1/3/1/4/131406544/6f322758048db48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fd0ba2b2d2e0.pdfIn PDF document text
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/fopopapav.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/pamilaxit-nokedevapox-notomovalisom-dixos.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/ja7Thic/vabifadeturodagoja.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/wanesidarive.pdfIn PDF document text
    • https://cdn.sqhk.co/xazakamugi/fIii8hf/80596533855.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/cdfce43c-206e-434c-b0c1-423e2eb47cf7/najagafuwojepivusazuvaxik.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/bol_radha_bol_full_movie_300mb.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/rugonexokujebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4eabce-6e67-4975-8f47-c37c951ccc8e/xeriluwebegijesivuk.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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5480 bytes
SHA-256: ef8c1f0a641ff400d0bb7b7cb2d025a6be2f5d8c9a217908d511956f582e2f33
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10500 bytes
SHA-256: 45ca487a372848561f3ce61ecb0fbeaeae669d0f8062b6f113f7a019bf00fd21

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