Malicious PDF — malware analysis report

Static analysis result for SHA-256 62910d8087bf5da2…

MALICIOUS

PDF

69.8 KB Created: 2021-01-29 13:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b40e57b2e90419700301a8459bd4a83b SHA-1: 14e1c3cd9fafc0bba86398304e6da253482af28c SHA-256: 62910d8087bf5da212aa04e3c94dddd5244bd9a1e8410bf392d3771ddba7f28e
74 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though partially corrupted, appears to be a lure related to a firearm manual, likely intended to trick users into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/123?utm_term=sig+sauer+sp2022+co2+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fcbe00758940.pdfIn PDF document text
    • http://trynutra.shop/55898541296p3wbz.pdfIn PDF document text
    • http://fruit-citrus.space/bio_medical_waste_management_2018izee0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff04024a52ae.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/4MtgdPv/zombie_clash_java_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fd3af287a31f.pdfIn PDF document text
    • http://ipoteka.net/xetagixarfksoi.pdfIn PDF document text
    • http://mivetys.xyz/zenudumudenoxesejvrnxs.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/jjehdjf/22954399231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fdfa16972f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojawesepex.rf.gd/96970520897.pdfIn PDF document text
    • http://miwofalixi.rf.gd/fuwuburugezetoxurujen.pdfIn PDF document text
    • http://bimivopi.epizy.com/sisabivazazivu.pdfIn PDF document text
    • http://gujusama.rf.gd/video_from_link_url.pdfIn PDF document text
    • http://kunijudodo.rf.gd/49186414315.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 5632 bytes
SHA-256: 0ad1899da9e02c594ba5647e755a225e59aafff0c511f64daf75f0a22b70fbdc
font_01_sfnt_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 14140 bytes
SHA-256: 152bb66e3e7aca6391602c4c51b6d7068bbe1de8d305e3e3c234e2579d70f7d0

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