Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db6fda1a7692bb9…

MALICIOUS

PDF

71.6 KB Created: 2021-05-10 16:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6afa03ec9f8b64da0506fce9496965b8 SHA-1: 9d9b6073c2a0b1b4c1d1eb790d988204c94ee948 SHA-256: 1db6fda1a7692bb908939deb41ca1af143d882432d270df248365dc1b99931ad
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'link farm' heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+to+make+a+blog+for+beginners PDF link annotation
    • http://tacfitproducts.com/how_to_heat_up_maggianos_baked_zitim89n0.pdfIn PDF document text
    • http://pigovaze.iblogger.org/gamurex.pdfIn PDF document text
    • https://zogopovedizojux.weebly.com/uploads/1/3/1/4/131408172/vijixajadakukax_fepukumodu_xakuwajowup.pdfIn PDF document text
    • http://vidclips.design/how_to_store_flammable_liquids_in_the_workplacegxk97.pdfIn PDF document text
    • https://subafeso.weebly.com/uploads/1/3/3/9/133986831/wupax-wegomusowav-najego-piwerurufam.pdfIn PDF document text
    • https://sodujamewo.weebly.com/uploads/1/3/4/7/134750465/depedolefuj-batajidireto-jiwokejuxoju-dewigexajap.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/lofesif.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/9075625.pdfIn PDF document text
    • https://jivezevovofefav.weebly.com/uploads/1/3/4/8/134896957/3368498.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/jcQkCie/sipajaxesegunozi.pdfIn PDF document text
    • http://bowanizi.22web.org/the_expanse_season_5_episode_6_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/ibphfje/grid_autosport_apk_invalid_license.pdfIn PDF document text
    • http://bettermoneytips.com/bpsc.bih.nic.in_admit_card_2018_downloadva03u.pdfIn PDF document text
    • https://lupomixuliwir.weebly.com/uploads/1/3/4/7/134728854/3502626.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/zidenigad/80495941065.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/libros_gratis_caballo_de_troya_9.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/road_maintenance_agreement_template_saskatchewan.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 5344 bytes
SHA-256: 02e745fe5eb1bf10aadf1748d2f9227d9c85ac2e25fc2e006bc9ee984f273a9d
font_01_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 10580 bytes
SHA-256: e50a29e6ab758db22a851d9e80bd3e6ada6f426c1a61c04826f90e1ec952857a

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