Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e94885118c0ab02…

MALICIOUS

PDF

84.0 KB Created: 2021-01-15 13:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c99317944624305ccfae14d4cf5da99 SHA-1: 176e2a72dc6c3cde048bf936c5ba1bf5d3c7844b SHA-256: 3e94885118c0ab025ab41512d56bc8436aa12f06e13e886a87e1c776af4f4df6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'traffnew.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document, likely delivered via spearphishing.

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://traffnew.ru/123?utm_term=basic+land+art PDF link annotation
    • https://site-1166710.mozfiles.com/files/1166710/asgard_valhalla_wealth.pdfIn PDF document text
    • https://site-1177683.mozfiles.com/files/1177683/wonuzox.pdfIn PDF document text
    • https://site-1246486.mozfiles.com/files/1246486/govupivafanarib.pdfIn PDF document text
    • https://site-1176277.mozfiles.com/files/1176277/84061222298.pdfIn PDF document text
    • https://site-1203147.mozfiles.com/files/1203147/toshiba_dvd_video_cassette_recorder_dvr620ku_manual.pdfIn PDF document text
    • https://site-1185297.mozfiles.com/files/1185297/79989724289.pdfIn PDF document text
    • https://site-1178160.mozfiles.com/files/1178160/protein_synthesis_diagram_answers.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/zageriviguku.pdfIn PDF document text
    • https://site-1173682.mozfiles.com/files/1173682/kiss_kiss_spin_the_bottle_online_game.pdfIn PDF document text
    • https://site-1173983.mozfiles.com/files/1173983/best_tune_for_2018_6__7_cummins.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/gufubukedudomun.pdfIn PDF document text
    • https://site-1176664.mozfiles.com/files/1176664/different_color_passion_twist.pdfIn PDF document text
    • https://site-1223979.mozfiles.com/files/1223979/69064058850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rirusozo/oh_baby_girl_lyrics_video_song.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_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 4984 bytes
SHA-256: fc164a138af65b68966e150339961aea2293105e21f8cd4ff4d737e8182da4f9
font_01_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 11764 bytes
SHA-256: bb3bae10121f109365ced1736b59741c2dd69929cd9285d74f1636e73ce84da1

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