Malicious PDF — malware analysis report

Static analysis result for SHA-256 da79f6c3bb35f641…

MALICIOUS

PDF

65.9 KB Created: 2021-02-28 03:09:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66daf5859c81a88d8d852d792d4187d2 SHA-1: 47a45547393ae4f0961748a32e8d7c5b52c66fcc SHA-256: da79f6c3bb35f641b378aec90c45904d7af5e1035eb5a0a8ca842f01d6eb0500
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains references to resetting a Samsung device, likely a lure to encourage users to click the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=how+to+reset+samsung+sdr-b3300n PDF link annotation
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/5333636.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/jcMXXjg/kefolazome.pdfIn PDF document text
    • https://dupomosukafe.weebly.com/uploads/1/3/5/3/135387566/juxufiku.pdfIn PDF document text
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/3211704.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/g04shhe/27494926635.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/iiidjjg/98445402610.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/416f4d4b9.pdfIn PDF document text
    • https://xugepofu.weebly.com/uploads/1/3/1/3/131383580/dfd271c168d2.pdfIn PDF document text
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/1463783.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/cool_blues_music_mix89k3d.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hAKDnq2/xuruwenotirilegalevok.pdfIn PDF document text
    • http://formulamoney.top/how_big_is_the_american_navyfvyx7.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/SST0gju/25472930512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lemibutudigosuv.rf.gd/ferrari_360_for_sale_florida.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/pepowovukojeme.pdfIn PDF document text
    • http://kunovudulex.rf.gd/lewmar_mainsheet_traveler_kit.pdfIn PDF document text
    • http://migegifixabo.rf.gd/hunger_games_book_set_barnes_and_noble.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_off0000c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50E 5644 bytes
SHA-256: ee7a8eb155691110cf9eb5bf664b534d2094d6f460fe7e020f6f0f6bc47228e0
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 10208 bytes
SHA-256: 7bacb35c61305232b9ff7ddd001d1d0a2e32ef46f89d77a5a6ef38dbb6248a6e

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