Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b84c9825defaee…

MALICIOUS

PDF

84.5 KB Created: 2021-04-05 09:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ce01217d34c29821b7d561f9dd8235 SHA-1: bf6bd38fb0510d4c7b581816a32932b4168f7adf SHA-256: f9b84c9825defaee24435c0b83f2df52f627bf5bf3478058b627818536df1f93
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though partially garbled, indicates a lure related to learning English for children, which is likely a pretext to drive users to malicious sites.

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://botokaw.ru/aws?utm_term=aprender+ingles+para+ni%25C3%25B1os+con+juegos
    • http://vidclips.design/lottery_scratchers_games71yz.pdf
    • http://shoop-fo.ru/746698659392h0qp.pdf
    • http://valuburikodajad.medianewsonline.com/wodareb.pdf
    • http://wtia.space/dugopaburudewes2wn06.pdf
    • http://difanitukovu.mywebcommunity.org/ballast_water_control_and_management_regulations.pdf
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fe9b6e0ed143.pdf
    • http://kenugizi.getenjoyment.net/dead_aid_dambisa_moyo_ebook_download.pdf
    • https://static.s123-cdn-static.com/uploads/4371258/normal_5fe42b2dd46e5.pdf
    • https://cdn-cms.f-static.net/uploads/4444877/normal_606a81aaaeb70.pdf
    • http://befotuke.mywebcommunity.org/criminal_law_amendment_act_2020_bare_act.pdf
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5ffe672f76331.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_604642491ca15.pdf
    • http://gajelifuluxapov.mywebcommunity.org/xusodukotifuxexewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xogijowag.onlinewebshop.net/radodagatoredizebo.pdf
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_28de4eb893e7428da4353859d6c47b8e.pdf?index=true
    • https://b9387e75-0942-48a6-8a47-0bd3f0224277.filesusr.com/ugd/fc485c_ac52ec607f0844fe92bea7adbafcff1b.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_c059c11c3ad34fc08eb84a187b496df9.pdf?index=true
    • https://s3.amazonaws.com/bededuxotulapil/how_do_you_remove_a_stuck_delta_shower_handle.pdf
    • https://s3.amazonaws.com/tarajix/csl_wireless-n_wifi_repeater_-_firmware_update.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9b.bin
a7f2a7405932167a5ca38efa5f96fbedf377c2c6dd428b19bd73d0a2d875d759
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 5320 bytes
font_01_sfnt_off00010c73.bin
3f36035b08f2c0691cef3afe94067d42f3cfd04710dab0b8abb04c438cdbcd16
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 12328 bytes
font_02_sfnt_off00013418.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13418 4324 bytes