Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcec405cd9be912…

MALICIOUS

PDF

79.4 KB Created: 2021-04-30 17:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3211f710162efa404208ce294c13acbf SHA-1: 0424b6f029883e7f03a4e9f2beeaa8fbe98d1b5f SHA-256: 7dcec405cd9be9127e096fc71ecbbc4c80050075997994933ff14967ae7ca339
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to vehicle value, likely directing users to malicious sites like jumiwimov.ru.

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://jumiwimov.ru/strik?utm_term=what+is+a+2015+silverado+worth PDF link annotation
    • https://cdn.sqhk.co/pixafosabow/hhJLlhb/north_star_dodge_san_pedro_san_antonio_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/ePwk0HB/siparomebenopaw.pdfIn PDF document text
    • http://zenarajare.22web.org/body_shop_youth_sheet_mask.pdfIn PDF document text
    • http://fowevuwakit.22web.org/10005399486.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/ijaFgh8/void_pyramid_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/aAKgjhj/home_design_3d_tutorial_espanol.pdfIn PDF document text
    • http://believes.space/insurgent_movie_in_hindi_dubbed_free_downloadfgxwc.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/fibhd0g/guriluxuneb.pdfIn PDF document text
    • http://normab-id.com/4608926785ltev1.pdfIn PDF document text
    • http://fc-aromat.ru/vaxopiximonuwatozw105a.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/idgdphh/.pdfIn PDF document text
    • http://zinekob.66ghz.com/76204351442.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/jijhjic/lizeraverenuzeximusutak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efdb493-d050-4c8a-8f5c-8f5de638064d/96454031320.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/demi_lovato_heart_attack_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/864282663.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/44730845666.pdfIn PDF document text
    • http://vetanafajodomek.epizy.com/84964982592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40061da-6a7c-4324-9358-faa77f94b0b3/who_installs_rinnai_tankless_water_heater.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_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 5528 bytes
SHA-256: d45fa72e3c2261727a976c811420ae636ba1c1ffe9eb606cb181735b52aeb161
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 13096 bytes
SHA-256: 5544776193a86fdb7f8e02db7d9411876caa34aeb2b9e2f0fc2944fccb56438a

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