Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8644bf55c37b2ae…

MALICIOUS

PDF

86.4 KB Created: 2021-04-01 01:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 14abdd430f014e6a32916845737a9a27 SHA-1: 12917df883e5709a4569231265b1bd28ce07cdbe SHA-256: b8644bf55c37b2ae8b4fc85c085fabe22fc1dd8c99a0a7a04d1f3e1c918f184e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains external URIs and is part of a link farm. The embedded URL, https://maypoin.ru/award?keyword=negative+effects+of+globalization+on+culture+pdf, is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and external links suggest a phishing or malware delivery attempt.

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://maypoin.ru/award?keyword=negative+effects+of+globalization+on+culture+pdf PDF link annotation
    • https://cdn.sqhk.co/mowanideju/tigjeZC/33355169641.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/V4RGjjA/77870554817.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367938/normal_6002a7d50fe93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601b7c6ce7e62.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/iRgegj1/goveruvu.pdfIn PDF document text
    • http://safagiko.iblogger.org/teri_akhiyon_ka_kajal_remix_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/fthidpS/29328937891.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/hfhcsVw/697900599.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/be6da933-16bf-43d3-bbf3-c720f06074f2/74018921615.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_d3780d9a6ea94fdf833534291a27acd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4be88c-75a0-4d44-b0f8-767fe5d140c1/lagituwanutasuxisateluku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d2c8b6-bf96-427b-a599-8c1b64ca62f9/57259110325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb0391f-b815-4e51-addf-615ac895050e/lopi_leyden_wood_stove_replacement_parts.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_4700886ed40c42428a61f13e7c646780.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0da37a6-1825-45db-a3c2-59bd578ae23a/thermo_king_code_49.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9292bb8-4c61-458b-9c7d-72449a3e61b2/big_fish_games_apple_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26ec6462-c61f-4def-b5ae-e7e67e3b3fae/when_nietzsche_wept_review.pdfIn PDF document text
    • http://jilufadipubo.epizy.com/nenuvenomojorokoxut.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_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 5544 bytes
SHA-256: 3b714fb47c9cb546718072b995e3afb8fc8fbf6c770be6eaec5d458c8ff58628
font_01_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 11400 bytes
SHA-256: 47c3416e6d99a4498df5c1b5dc81087b8197b41ea1f066194b8189fc080d861a

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