Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f5c72ce2e7bcd2…

MALICIOUS

PDF

66.7 KB Created: 2021-03-03 01:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d0f9e8207dbc06758f55a2b40721a945 SHA-1: d70a7fff3670cee2ca93956732fac23991f3e092 SHA-256: 39f5c72ce2e7bcd29227382a9c73c96c462cdfbbc87b08fe7ad6e30472f36e33
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to an instruction manual, which is a common tactic for social engineering.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=le+bistro+cat+feeder+instruction+manual In PDF document text
    • http://zokumujanuni.iblogger.org/89146869120.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/bekukimigaku.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/furajowakopetosasuwiseko.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/5656575826.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/4GljeKG/wikipedia_english_home_page.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/louise_l._hay_libro_tu_puedes_sanar_tu_vida.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/nikon_coolpix_p610_price_in_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/pjg226S/fighter_pilot_heavy_fire_mod_apk.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/11422296219.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/lavoxulijalujediguluj.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/how_to_explain_reading_comprehension.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/best_online_data_science_masters_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/gfiijcY/gangmaster_licensing_act_2004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/momabovolu.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/english_vocabulary_in_use_elementary_cd-rom.pdfIn PDF document text
    • http://medidadebi.rf.gd/bpsc_application_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/vojakolimibajema.pdfIn PDF document text
    • http://xubobesirubujo.rf.gd/chamberlain_garage_door_opener_manual_41ab050-_2m.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/19206866880.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/89776148604.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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 5248 bytes
SHA-256: ce917baed54c5d911183eeb523f76b2b1c2ec8bb6e036e83541773eeaa9115d5
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 10468 bytes
SHA-256: 8ae5e1f6c3889776ac8ef3f69757b7f5ffecf70cb078c16ec1824381f589cb89

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