Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc7c1d152561a49…

MALICIOUS

PDF

73.1 KB Created: 2021-02-27 10:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae81839587073a89cfffe3402186040 SHA-1: 29b73fcd0b0aa687c8eafbeecda9c33f7f824b15 SHA-256: 1fc7c1d152561a49f4c7914bd3b89e25fa481dada34e9a394c0f7918c624734b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=how+to+count+the+number+of+weekends+in+excel
    • http://idealica-uficialeitalia.website/fandry_song_free_download_mp3yji8x.pdf
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/buzigajakifija-tedukekug-gesinuwojuxored.pdf
    • http://bopikifej.22web.org/enable_usage_reports_sharepoint_2013.pdf
    • http://xuwivezotuw.22web.org/simple_border_designs_in_a4_sheet.pdf
    • http://cartest.pro/jinaramazaduv4cchs.pdf
    • http://vostokzapad.su/74849755599sq0ae.pdf
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/kokobu.pdf
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/kemurinetagu-mifagotizusen-nirewik.pdf
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/semito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixadamobus.epizy.com/96032102371.pdf
    • http://sidijujaz.epizy.com/45961486106.pdf
    • http://wafubarig.epizy.com/jpg_to_online_converter_1mb.pdf
    • http://duzoxugulof.rf.gd/53227877435.pdf
    • http://zarazemudaseri.epizy.com/alan_walker_fade_ncs_release_audio.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb1.bin
726bd27dafc968c52a2b41b340f268d4e5d0e731eedc8da6d2fe6adb16f957e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 5376 bytes
font_01_sfnt_off0000f1e4.bin
ac1a8ff44640614f0e9d1d22b5ab3693b63b6a0cb7a545a61907daf5d1043b30
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 11004 bytes