Malicious PDF — malware analysis report

Static analysis result for SHA-256 a661d98a7072b9dc…

MALICIOUS

PDF

81.3 KB Created: 2021-02-18 02:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a970006f0fc4ce97e4a003491627fbc6 SHA-1: ebcddb3201a14dae7f40f00633b75cfcf9e7aa64 SHA-256: a661d98a7072b9dc4866c540957636b66ffbefa14feb558944516b5eb3b0145e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

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://bologen.ru/wix?keyword=rosario+ala+sant%25C3%25ADsima+virgen PDF link annotation
    • https://cdn.sqhk.co/seponidozit/CgchiRA/xizexupoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/ggjijhb/zizulokow.pdfIn PDF document text
    • http://nuviteb.22web.org/ultimate_mechanical_keyboard_keycap_replacement_guide.pdfIn PDF document text
    • http://naturfresh.fun/nugobaronulezojozoxhjh.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/hSgjrF0/kegozenapag.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/M3gfUqr/13550599669.pdfIn PDF document text
    • http://steh-sistem.ru/cyberghost_crack_for_pcqfgru.pdfIn PDF document text
    • http://technodom11.com/to_answer_someone_back_meaning5liq2.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/Ogghggg/2558166111.pdfIn PDF document text
    • http://trackengine.host/wupijisimowegio48et.pdfIn PDF document text
    • http://lutefofojonu.iblogger.org/zepemelopuladono.pdfIn PDF document text
    • http://ledy66.net/wixuvifenijofekubulilulp5m2.pdfIn PDF document text
    • http://getne.xyz/3770731671863828.pdfIn PDF document text
    • http://select-get.top/temporal_and_spatial_data_miningytmng.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warufadul.rf.gd/ablative_absolute_worksheet_answers.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_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 5128 bytes
SHA-256: 268dbb286a56837d6dc87b33b4288fbec2e3b5de21b93676476b0495dbf17235
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 11724 bytes
SHA-256: 8933907e40948fa15c7ce8267f05acea560da0d060fb6318e9f8a6100c7d1912

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