Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98c5b9a149beb89…

MALICIOUS

PDF

83.9 KB Created: 2021-02-25 17:34:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3b6dcff924c3319404437d7c29149d67 SHA-1: 89080869e1a5abf11ea273f20ffffc7ff345e548 SHA-256: a98c5b9a149beb89a493518d70367a8a3b6193402c831a5a1e923632d65ede9c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to the Affordable Care Act, suggesting a lure to a malicious site.

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://druttle.ru/award?keyword=what+was+the+purpose+of+the+affordable+care+act PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405190/normal_60305c5aa0c78.pdfIn PDF document text
    • http://9gusevshop.space/banadewevuzawosatarojhj736.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/aaihgCT/93676191631.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hixgit7/fozulekusemeno.pdfIn PDF document text
    • http://hurleyshamburgers.com/wivaf5wc9n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_5fdb40a850029.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/what_goes_well_with_navy_blue_pants.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5febd08a67555.pdfIn PDF document text
    • http://frankiearvelo.com/timisaxapidusibilunufusuk7y3u.pdfIn PDF document text
    • https://cdn.sqhk.co/kubarevopew/hbjdjhq/hitachi_compute_blade_2500_datasheet.pdfIn PDF document text
    • http://rineset.xyz/62064897991n95y3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_6024889447d48.pdfIn PDF document text
    • http://sodalabs.pro/zuledenexanageserikueqb3k.pdfIn PDF document text
    • http://naturalm.space/aloe_vera_plant_information_in_englishnh2ij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafugigolemetuk.rf.gd/clash_of_clans_coc_ios.pdfIn PDF document text
    • http://kubuxakul.epizy.com/penny_stocks_to_buy_robinhood.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/5945202306.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/blank_death_certificate_template_uk.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/73458626168.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_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 5488 bytes
SHA-256: b3e8d0581be6f5b21f4a15d1b7a5f3d0888691d9d28153af8c4c6abceae0b2e4
font_01_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10660 bytes
SHA-256: 5c9e548a4a7dc17633e6e1f17d6ac7fa18d87bfe7fa9f480003bd967227d3a37

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