Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f5acb8b5c23ce2…

MALICIOUS

PDF

106.3 KB Created: 2021-01-28 11:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 72872e15cc59f8528645d511a2b1f3e9 SHA-1: e8bed1176aef702695d8f7395bfede8e84b36e6d SHA-256: 38f5acb8b5c23ce2d141f0c5e767ce94ada7f9ee39a0a09d25a95c1f4cd793e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful external content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/aws?utm_term=after+braveheart+parents+guide PDF link annotation
    • http://xofajenakimexo.iblogger.org/tvs_bartender_software_free.pdfIn PDF document text
    • http://businessoutsourcing.info/758574910912x8w4.pdfIn PDF document text
    • http://xofazonir.iblogger.org/27579660504.pdfIn PDF document text
    • http://appletopshop.ru/zupipuzetubupunarinemumux3e6q.pdfIn PDF document text
    • http://poverkavoda.website/levas6hmus.pdfIn PDF document text
    • http://evatopshop.xyz/extreme_sports_car_driving_simulator_racing_gamesm81n5.pdfIn PDF document text
    • http://luminar2-download.xyz/basogesedimasagetbpri.pdfIn PDF document text
    • http://topstop.site/tizawozirasomula8df8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fd95b0012b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473047/normal_5fe6d68cc87da.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/98717987468.pdfIn PDF document text
    • http://ridunculus.com/ninja_air_fryer_reviews_amazon9o0tc.pdfIn PDF document text
    • http://blognews.top/national_defence_academy_coursesibj69.pdfIn PDF document text
    • http://xekokikimelaf.iblogger.org/tenant_surrender_agreement_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_6008dd3852a82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujonejetas.epizy.com/zozugemuvelutozeta.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/avital_4x03_remote_start_manual.pdfIn PDF document text
    • http://rarezutawuwelam.epizy.com/legetubotopifu.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/talonunotebufoxipigo.pdfIn PDF document text
    • http://kilaliwe.rf.gd/60041415300.pdfIn PDF document text
    • http://jibufunipibavu.rf.gd/vipagivek.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_off00015fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCC 5460 bytes
SHA-256: d4177e9f8dec6a720ff2e20a9ee5ba982fca8318755ec5f142e2ffd5c7a05f1b
font_01_sfnt_off0001725e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725E 12952 bytes
SHA-256: e1e2b314625af553dd121b7ac90ac48e6a30b3e0bc3f5b9da03ff76402fc86ef

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