Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35c986ac67ac485…

MALICIOUS

PDF

91.6 KB Created: 2021-02-24 15:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 90b724bbc64677df70f9680317af06b7 SHA-1: 75cf2c350e82b196e22d0ec8b645de8331786dd4 SHA-256: d35c986ac67ac48580b7e927abd4a844a32302b8675772bb913328117dbe55c8
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, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to job salaries, likely serving as a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=how+much+does+a+principal+engineer+make PDF link annotation
    • https://cdn.sqhk.co/vomisape/jiI4njh/angry_birds_blast_apk_free_download.pdfIn PDF document text
    • http://organize.shop/4289120553806s36.pdfIn PDF document text
    • http://xapozibun.22web.org/sezarudebuvutofokape.pdfIn PDF document text
    • http://copyright-central-media.com/kopujuturoninogomwnb.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/aYghgie/94920629418.pdfIn PDF document text
    • http://yachts-4-sale.com/fidelity_investments_canada_ulc_annual_reportfkrqi.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jhv99ul/sowamuwovebebejepax.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/fhcreje/how_to_discipline_your_child_howtobasic.pdfIn PDF document text
    • http://kismykeitio.best/fundamentos_de_marketing_kotler_descargary09p6.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/ahfjeii/costume_store_nyc_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tutopuwozel.epizy.com/charlie_brown_song_piano_sheet.pdfIn PDF document text
    • http://zilenidebu.epizy.com/formal_dining_room_sets_with_buffet.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/dornbracht_mem_water_sheet_bath_spout.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/how_to_replace_alternator_on_1996_jeep_grand_cherokee.pdfIn PDF document text
    • http://mipimusamed.epizy.com/mawofak.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_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 5604 bytes
SHA-256: 139263581d3751844011722643a5abcf5217aed1ae796f446c6d93ddb707d886
font_01_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 10636 bytes
SHA-256: 228b0582092b7632738c70447de6a4dc98ec3ce45238a70d272ae53bc11a1902

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