Malicious PDF — malware analysis report

Static analysis result for SHA-256 563167c22d5c0c94…

MALICIOUS

PDF

66.4 KB Created: 2021-02-24 04:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 566a3093df9c678c7ff70be51b6cdef6 SHA-1: c5081d4f32e60e7004d67384cab8076197153f2c SHA-256: 563167c22d5c0c94e280e13549799150ee6d11f1a911abcf8215f41051f68e46
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+do+i+thread+my+bobbin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff65732b1cc4.pdfIn PDF document text
    • http://dugules.iblogger.org/38672988327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_60176aa960f8d.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/hhm7Cyd/50009084741.pdfIn PDF document text
    • http://wimilarudiza.iblogger.org/solar_putty_gns3.pdfIn PDF document text
    • https://sazezikamujut.weebly.com/uploads/1/3/1/4/131438312/mebelite.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ijjUChb/cloud_raiders_apk_free_download.pdfIn PDF document text
    • http://sizuxubotinukor.22web.org/what_does_the_term_intercessory_prayer_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/cPlhdPA/vurukowuvekukenupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loxosufodu.epizy.com/reservation_cancellation_requisition_form_fill_up.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/garmin_rino_650_vs_750.pdfIn PDF document text
    • http://pagiwufuvefukuf.epizy.com/nolal.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_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 5152 bytes
SHA-256: d1da9d6028e3eb59e951451f712e484d647e8489bbbf9a13a0beef90ef45082b
font_01_sfnt_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 9832 bytes
SHA-256: 7b772ef1945d1894a282e32d2df9d3a267813137d94d783f79930ed8b91084f8

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