Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae21d387a94e26e…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 02:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fa8f903f9b855c184c9f852ec739e6cb SHA-1: 4def415a11effb904495d837af71aaae12af8858 SHA-256: 7ae21d387a94e26ea60ccd554a0955eceda11dc85fdb04c6cbe6c9a4c25acdcc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'golowaki.ru' which is presented as a search result for a product manual. This suggests a lure to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=bose+cinemate+15+remote+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fcb6b9b4e3d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501634/normal_5ff7b90c34603.pdfIn PDF document text
    • http://soul-felt.com/kudewopavapawenidobetifa0fcz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_601f1032323a7.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/fedomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_601cb38eb0340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ffca7e859930.pdfIn PDF document text
    • http://hocostyle.ru/asmaul_husna_melayuld1k6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_600f7899a93d2.pdfIn PDF document text
    • http://letgtma.bid/10967765359e07pi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fc9c7e4d9987.pdfIn PDF document text
    • http://sokinabunerir.iblogger.org/buzijidabexomugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5fd27ee1ade87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_6032af067ec28.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/sitelojopesigesobozi.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/wuponuwotokir.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/zalomi/sozasutaserafedidowefem.pdfIn PDF document text
    • http://vuripuwap.epizy.com/nugemigaxo.pdfIn PDF document text
    • http://vazavaxajude.rf.gd/the_central_park_five_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/soundcloud_audio_er_firefox.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/fall_doodle_coloring_sheets.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5052 bytes
SHA-256: baeb40841d810eb1a7d8a52794241e9bcb23ff6f5861e9b1c5a1b234eb0d7055
font_01_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 9936 bytes
SHA-256: 1f1956f6576055706bc861a3a98b6efab03b5d6139aae3d3d1aaaff074b71da2
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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