Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2637dc6ac3f0749…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 12:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4554ac873e29b9e8b011a22c06b3fc68 SHA-1: b08a0592a31dff76313a38920ac0e77469417960 SHA-256: c2637dc6ac3f07493a5c51a7f8c1e4ac49cae3b127d9f4a4e0a055daf1e8799c
126 Risk Score

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 one specifically linked to a search query about appliance repair. This suggests a phishing or scam attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/strik?utm_term=how+to+reset+filter+on+frigidaire+dehumidifier PDF link annotation
    • http://pidusejop.medianewsonline.com/beckett_graded_card_price_guide.pdfIn PDF document text
    • http://chebsvet.ru/italian_food_recipes_with_picturesavut6.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/how_much_do_soccer_referees_get_paid_in_south_africa.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/94385525270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6033ba02abbe3.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/bella_durmiente_cuento_original.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_5ff401c61c6b9.pdfIn PDF document text
    • http://timinome.getenjoyment.net/brother_knitting_machine_spares_uk.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/dofegenamuvusezofik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_6032399a7f464.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/bissell_cleanview_vacuum_operating_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fd2198fab036.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/duxuzobolafapiselaju.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/bekopozaraviwelonaxuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_6024662c24d6d.pdfIn PDF document text
    • http://clientesdkb.com/apc_smart_ups_2200xl_manualznztx.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/b22694c2-e08a-401b-a638-3a28ac4dbbe4/abnormal_child_psychology_7th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bd29b1-473b-45e2-92f8-5f2ff574f620/57133835557.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5376 bytes
SHA-256: bc22dcdcd50766ece012c9312dbb90eacf5401956ca2be1adf1a7675b52ee041
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 10500 bytes
SHA-256: f94a5a13314d138b530c8dd015c0db4046a9c091b06e25c58428acec8a70ef18

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