Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1556ba265428d00…

MALICIOUS

PDF

100.7 KB Created: 2021-03-28 14:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85e09acb30da5df493c45388d1054839 SHA-1: b181f00d03d25ce04b4e3b3521c1e35a005081da SHA-256: f1556ba265428d005ab169e736814138aab346e8aa49ff3c825b5549db3384d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection confirm its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to essay writing, which is then used to redirect users to malicious sites like fokemale.ru.

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://fokemale.ru/strik?utm_term=how+to+write+a+college+essay+about+yourself PDF link annotation
    • http://spencermcman.us/jejerofixatinifasizaxuvxtq.pdfIn PDF document text
    • http://cyberghost.store/fokomit3prs8.pdfIn PDF document text
    • http://gonzo-3d.com/tablas_de_excel_para_descargar2ui95.pdfIn PDF document text
    • http://itdiscount.pro/zerob1xjso.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/jhghgf2/real_nfl_football_jerseys.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/PhisNhf/throne_of_glass_book_set.pdfIn PDF document text
    • http://groby-ritual.online/digikala_laptop_dellko4qe.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/descargar_el_pianista_latino_hd_utorrent5ugmw.pdfIn PDF document text
    • http://polikarmonolit.ru/96926701851uqyd3.pdfIn PDF document text
    • http://gloslides.com/bojugolevubumonajaxilid259ko.pdfIn PDF document text
    • http://good-production11.site/sony_dcr-trv280_reinsert_cassette_errorrc4g1.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/jbl_flip_5_portable_waterproof_bluetooth_speaker_walmartxke2u.pdfIn PDF document text
    • http://coolmag.biz/how_do_i_put_my_samsung_dryer_in_diagnostic_modezq7sp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/668017bb-73e3-420c-920f-2893c7e2c9d4/34362914387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add53f2a-176e-499f-bbf5-e30e92e57436/schwinn_ic3_indoor_cycling_exercise_bike_with_40_lb._flywheel.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/35053747631.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/ledepibuwudes.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/angela_carter_bloody_chamber_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/70190469700.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/sujilowagafureru.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7E 5344 bytes
SHA-256: 2c1f3b344e46a597d48e977877b9547a8050eac533d3be96be27cf232ae83862
font_01_sfnt_off00015fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD0 11124 bytes
SHA-256: aadd0ea231ae8ba023797456b342ea67d49a9edee9ec2557ed3f530d3c1fe8d8

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