Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4c6dfddc905ec2…

MALICIOUS

PDF

91.4 KB Created: 2021-04-14 02:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: afcbe1242922dabdc941c5154a5cadf0 SHA-1: 37685dec8fb5bdd90297a98e5e4ec023a87940d2 SHA-256: 5b4c6dfddc905ec26ea7a9bdfb9d71d020fdec638fb13d779a635e794d2aa5bc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or SEO manipulation scheme, potentially leading to further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=the+birds+and+the+bees+ac+odyssey PDF link annotation
    • https://bezumovepefare.weebly.com/uploads/1/3/5/3/135337037/noxonuruwofuludomet.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/hfkr0id/sticker_maker_stickers_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/goihhaA/japanese_abc_with_english_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_6023f3690a8c1.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/fjbmgi2/48042743972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5fc5c943975f0.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/angiographic_views.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/pewakesi-vobuliniriba.pdfIn PDF document text
    • https://cdn.sqhk.co/fekebazi/c6DicFF/memobijufibaxezez.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/gBpijgc/jotowujofutotifiwujor.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/kevuvupige.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ypZbihZ/nosodamizolusododenimeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_5fd996ae8bd84.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/eidvjbN/84437154720.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/7815722.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/antony_and_cleopatra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_606c9b8aa4b6e.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/8rhegh5/beating_heart_hd_video.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/inorganic_chemistry_principles_of_structure_and_reactivity_huheey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasosurid.epizy.com/letter_format_in_gujarati_language.pdfIn PDF document text
    • http://puxakuxuvon.epizy.com/75600542017.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/sindrome_de_asperger_en_nios.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/80707219426.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_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 5188 bytes
SHA-256: 0f82c6202f019acfd07e8f75d3b04440d1ae5bcbd17366d6428f002d3b6b2af3
font_01_sfnt_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 10992 bytes
SHA-256: d0af5f96f191321e403f4c8253f7aa0e6b1e48c72467def6e4f4a291c1f3db55

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