Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12cbe41d72b8ce4…

MALICIOUS

PDF

102.1 KB Created: 2021-05-13 21:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2dbc49db4a557bd72546ce3f94cae2ac SHA-1: 50f16b22e2d5849984d887d4865b4122feb5fa11 SHA-256: f12cbe41d72b8ce4a60ba9269ba9c842d92b3ceeeb42ae973ed976f4a747f2a1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=state+four+importance+of+curriculum+evaluation PDF link annotation
    • https://cdn.sqhk.co/fagaxirupunu/cAiejao/35610303403.pdfIn PDF document text
    • https://cdn.sqhk.co/jorimalid/hiUifji/56932472374.pdfIn PDF document text
    • http://cherrypimp.online/how_can_i_chat_with_facebook_support_teamkqdql.pdfIn PDF document text
    • http://pushbiz.fun/730404036006sbtw.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/hehiDih/fox_bet_super_6_app_nascar.pdfIn PDF document text
    • http://byseles.xyz/city_drifters_unblocked04ndx.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/ijfylgi/73389612124.pdfIn PDF document text
    • http://cherrypimp.online/vegan_food_list_for_beginners_ukkyvvk.pdfIn PDF document text
    • http://botodowur.iblogger.org/90659795547.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/gJO0xKc/8_key_leadership_qualities_of_joseph.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/icpaWja/tegafobiwelowedideweboxe.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/hcicjd5/cloud_bread_pizza_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_4f2b6c9c324b44d1864e0964ae34cd41.pdf?index=trueIn PDF document text
    • http://durunorutap.epizy.com/56402783498.pdfIn PDF document text
    • http://tuninedup.epizy.com/49789336932.pdfIn PDF document text
    • http://belunovozexuse.rf.gd/free_printable_kindergarten_worksheets_letter_u.pdfIn PDF document text
    • http://pinezininefos.epizy.com/38282748881.pdfIn PDF document text
    • http://mujunuge.rf.gd/62235623863.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_b303b1fcb69d4eaf911a8c7d8a265296.pdf?index=trueIn PDF document text
    • http://zudovufakigib.epizy.com/frigidaire_dehumidifier_ffad7033r1e_manual.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_ffae26d4f6844f2585662043f0051e72.pdf?index=trueIn PDF document text
    • http://jasigobup.epizy.com/91276849301.pdfIn PDF document text
    • http://puxebarasap.epizy.com/xejinebuw.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_off000150e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E8 5148 bytes
SHA-256: 1a8f37434ce3bf4e6ac9ac213f008307eb4ba300652658f8cd4475db02d13f02
font_01_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 11844 bytes
SHA-256: 0ac21c1cbcde20c9e4b91295b4d8d6b7d031fcfa5d5529f63ddc7640d7a9a78d

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