Malicious PDF — malware analysis report

Static analysis result for SHA-256 add28999e896aa84…

MALICIOUS

PDF

77.3 KB Created: 2021-05-09 15:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6e56301b5840a453a0f653fe1342c13 SHA-1: fb47f64163f0c9573e9fcedcb7073dffd9878f53 SHA-256: add28999e896aa842f35b8a1c4b6f899d30eb7d67cdd0c7885af6eaffb7f1890
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=portrait+drawing+artists+famous
    • http://mikazuxo.mypressonline.com/seven_deadly_sins_in_the_catholic_bible.pdf
    • https://cdn.sqhk.co/ranemagesoga/fTjdjbz/live_wti_crude_oil_price_in_dollar_today.pdf
    • https://cdn.sqhk.co/tisojubew/d06l9ij/commercial_truck_driving_simulator.pdf
    • https://cdn.sqhk.co/fojilude/ijoffIx/18559248555.pdf
    • http://xonigej.mypressonline.com/how_do_i_become_a_secret_agent_in_club_penguin_rewritten.pdf
    • http://safagiko.iblogger.org/sasaj.pdf
    • http://safagiko.iblogger.org/22450358326.pdf
    • http://bagomebefekixob.getenjoyment.net/polaroid_originals_color_film_for_sx-70_6004.pdf
    • http://luderoniripola.iblogger.org/eventide_h910_harmonizer_manual.pdf
    • http://jabalok.iblogger.org/kapel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xizokenimufewom.atwebpages.com/48311606194.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_eeff295c920f408aaa2c5f6816aa03d9.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/college_gpa_calculator_excel_template.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_e5f94593afd54d69a59f328810565183.pdf?index=true
    • https://s3.amazonaws.com/piwanisaj/24161107990.pdf
    • http://jofosomorigifo.rf.gd/xiwujavova.pdf
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_d8a6153e16f24222895043b424f55154.pdf?index=true
    • http://gapuxekoxegibeb.epizy.com/19903369138.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_673c6323575f458c825e4a177788589f.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_15396981918d4528ab2dbdd2ac96d815.pdf?index=true
    • 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_off0000f03a.bin
f9534ef714bb2739e507b891d2131f58be751325e775bf1c6993c50baa1540f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 5288 bytes
font_01_sfnt_off00010238.bin
47f3327e30e484abec045758e2282f5ca2fb17ce3ce803ae709053882afacf42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11304 bytes

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