Malicious PDF — malware analysis report

Static analysis result for SHA-256 776829dd2dbce91b…

MALICIOUS

PDF

72.2 KB Created: 2021-02-04 06:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2e65a27a8c35cb4dcdc52c4824a5b153 SHA-1: 4fc39c546e7c82990d595d9a62612a5e76387b40 SHA-256: 776829dd2dbce91ba166e098949aa2454056163c09c3f0c8b006672d1b9be413
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that redirect to other PDF files, many of which are also flagged as suspicious. The document body, though heavily obfuscated, contains text related to 'Navy corpsman uniform regulations', likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=navy+corpsman+uniform+regulations PDF link annotation
    • http://gobigs.space/mujijupuvezudovunuzigowfe9j3.pdfIn PDF document text
    • http://ridunculus.com/xajitisogizanopalepafotxjyp6.pdfIn PDF document text
    • http://biolinkus.me/tumblr_girls_g_eazyanfhj.pdfIn PDF document text
    • http://yandex-delivery.cc/andres_segovia_asturiaspeecg.pdfIn PDF document text
    • http://busevabafumoje.iblogger.org/etiology_of_angina_pectoris.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5fecb94eaa761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_6007e271b89ba.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/VehQr1W/29319280122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_5fd5f84cee0e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lunupoxupa.rf.gd/51663101800.pdfIn PDF document text
    • http://tuwafexom.epizy.com/psychology_of_learning_noun.pdfIn PDF document text
    • http://lesexuxu.rf.gd/legaligugapazojugufew.pdfIn PDF document text
    • http://vudemiziwifimo.epizy.com/precalculus_word_problems_worksheet.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 5464 bytes
SHA-256: e931d24ff26814d34697b564ef053cd3b7bd932d373e1e70d9d483df28c44f4c
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10320 bytes
SHA-256: 16ca8ffc86568a2d0d7e28ded53beb64160a8def12adb5f103523c966a8afd62

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