Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffffc0116e7f5e7…

MALICIOUS

PDF

77.5 KB Created: 2021-03-06 06:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0729905466ed062d9d6624b5f1436db4 SHA-1: df459f9d50aa77735cfc390c76d1dc71f7613e5e SHA-256: 4ffffc0116e7f5e7e7d717e6a40a82b47801eeb05208388a7fa578d92ceda46c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gimoguvi.ru/strik?utm_term=fifty+shades+of+black+trailer+english PDF link annotation
    • http://forsage.pw/who_hypertension_guidelines_2017e42pz.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/how_to_find_mass_flow_rate_with_pressure.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/nijwhfQ/troy_united_methodist_church_troy_tx.pdfIn PDF document text
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/guzorekuvijuperif.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/bofuxinuti_jagorax_wivaxivarinek.pdfIn PDF document text
    • http://spacexfoundation.net/the_100_kass_morgan_settingamzlr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_600257cef4173.pdfIn PDF document text
    • http://govovimifakine.mywebcommunity.org/81407713395.pdfIn PDF document text
    • http://lofitner.buzz/siluxodurudakigexifekes4jaee.pdfIn PDF document text
    • http://dompodklyuch.com/why_is_my_sky_modem_flashing_orange66jkx.pdfIn PDF document text
    • https://cdn.sqhk.co/nofevemumidu/jdOgdgd/dinapomifepatutopopo.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/best_poems_books_to_read.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/cifigIu/radioactive_decay_graph.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/alexander_naa_songs_freeybsin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_60047cf73d9b5.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/homgdgf/93354880350.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/lobeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozuxinub.epizy.com/53718341722.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/suwogutopagarovoxuri.pdfIn PDF document text
    • http://gabozimipuz.epizy.com/bivotenibobodenosenuku.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/tiset.pdfIn PDF document text
    • http://bejiteviv.epizy.com/bufas.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/84737350537.pdfIn PDF document text
    • http://kibululugavi.epizy.com/22965493626.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5544 bytes
SHA-256: b8d48ba648ab459a8acfa867ba2bc414bc727843805b70d4a4f9e1684356cb24
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11440 bytes
SHA-256: 58697baab1ad292f514f402e3be1713a9b04e1c23be4935f695c064ccb99c14a

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