Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f023783df1e18d6…

MALICIOUS

PDF

80.7 KB Created: 2021-04-14 19:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 276fbdda36370285dd4ea25586dec465 SHA-1: dfa916cd3abe223983860715a57730d2db29ec69 SHA-256: 6f023783df1e18d6e4d5aa3dad94a1d3c0ae18a07613771e52ae98e828234d65
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 0.9996

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://kuzutuzo.ru/strik?utm_term=what+is+adaptive+daily+living+skills PDF link annotation
    • http://lnstagramverifiedbadgeservice.com/dusenopupatukirubopiatv82.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/eggigja/flying_penguin_name.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/75b5de376f6af1.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/57b250.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/timujufatufidor-xulosagizuribe-kikupevaka-dalilirifu.pdfIn PDF document text
    • http://shoop-fm.ru/74511111758jua1b.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/runovigonene_doduf.pdfIn PDF document text
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/moduwofaka.pdfIn PDF document text
    • http://picsonair.com/solisxflkb.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/fawurelowuxilibe.pdfIn PDF document text
    • https://lidawutoroliv.weebly.com/uploads/1/3/1/8/131872032/ralozazasuwem_wadudo_neguz_vuduliwodel.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/mgcvieR/33286398944.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/waworilo.pdfIn PDF document text
    • http://vvinorama.website/links_awakening_face_shrinerbkqr.pdfIn PDF document text
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/rejedifune-xukenozidege.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/solving_systems_of_equations_word_problems.pdfIn PDF document text
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/vowemenubigezax.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/65516249922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/75147936367.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/edsby_hcps_report_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/how_to_read_milliamps_on_a_fluke_meter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 5364 bytes
SHA-256: 468d31b273f624bf4fe5ed9fd04468ebb73812748857c660b25fa052998e2512
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 10516 bytes
SHA-256: 855fe3924cf420f077718f661085851f78f136fb2b354247da6b47d87b96cadc