Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3780f98963a592…

MALICIOUS

PDF

70.9 KB Created: 2021-03-02 23:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13492621366d19d0cf712903215df5bd SHA-1: de3a3844e5eb09ff4fb40f5fba6819566833d27f SHA-256: 8c3780f98963a592b21504ba033808f9d3d1f0e56fffb093550d387ca8b99bf7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://pelibifir.ru/strik?utm_term=does+amazon+prime+have+fifty+shades+of+grey', is designed to trick users searching for specific content into visiting a malicious site. ClamAV detection and ML classification confirm the malicious nature of the document.

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://pelibifir.ru/strik?utm_term=does+amazon+prime+have+fifty+shades+of+grey
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fdd40016b2ed.pdf
    • http://rowaxuxot.22web.org/manualidades_con_palos_de_paleta.pdf
    • https://cdn-cms.f-static.net/uploads/4481423/normal_6022e7f19fdb7.pdf
    • https://cdn-cms.f-static.net/uploads/4380881/normal_6011e0511be45.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_5fe6c09da3fbd.pdf
    • http://xujimutisep.iblogger.org/kigelinajudefenabovub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vukenorap.epizy.com/significant_figures_worksheet_with_answers_chemistry.pdf
    • http://kusofiwu.epizy.com/kigizinetakoj.pdf
    • http://vupafigimewex.rf.gd/kasanivixode.pdf
    • https://s3.amazonaws.com/jaxesabi/nevazonogumibusatobim.pdf
    • http://luwawabegopit.rf.gd/how_to_assess_for_bipolar_depression.pdf
    • http://pevajaxujob.epizy.com/gutolexejapexal.pdf
    • http://penisidisipifo.rf.gd/xomorijawonamopawi.pdf
    • https://s3.amazonaws.com/fidobakipivogit/zulow.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60b.bin
fd67955cfdb1d880f37407154e1916763d291c678d76752898797f4e6efb95a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 5636 bytes
font_01_sfnt_off0000e92b.bin
c35089e4281d0a46714d8a43bcdeb9d00ab5dec2a22971c55fbf663a74b56a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 10936 bytes