Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbaa5af23aa53cf…

MALICIOUS

PDF

81.1 KB Created: 2021-04-08 09:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a07c8acd98f0ade756e0a8c597409f43 SHA-1: 5f083de9d2a884ac6efbda80d89d0cf7324a1da7 SHA-256: abbaa5af23aa53cf027e99c5dd8f119a174c8c0edbec95b0248e8e3672f5ac2b
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a significant number of links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier output strongly support its malicious nature, likely as a phishing or content-serving mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=which+dictionary+app+is+best PDF link annotation
    • https://cdn.sqhk.co/rozesivotix/iiigHhi/breckenridge_gold_runner_alpine_coaster_cost.pdfIn PDF document text
    • http://thefortykuti.com/37867238356lr4jw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_60158f6d0f5db.pdfIn PDF document text
    • https://kukusekiwija.weebly.com/uploads/1/3/5/3/135389364/e3478dcbf10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_6006334bb629c.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/sedutinojevopeb-kagumejaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450043/normal_5fca946ada2b3.pdfIn PDF document text
    • https://jaluwaxigesife.weebly.com/uploads/1/3/4/6/134640648/5034302.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/hjMlOhb/bobaw.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/RRigNhe/tovugisevij.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/leporiwibexuwev.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/hyN6NN1/basketball_shot_clock_price_philippines.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/bitawasupakukiw.pdfIn PDF document text
    • http://kamaz-ftc.com/8_ball_pool_hack_ios_2020_downloadhuyrz.pdfIn PDF document text
    • http://xefopuro.mypressonline.com/43251869754.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/kqMiaig/shark_ion_robot_r750_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/fCrmi9a/7975004330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fee9b5712535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_600b17112b430.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/jgTF890/dictionary_app_download_free.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/9480075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zudupaxub.myartsonline.com/72860729835.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_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 5172 bytes
SHA-256: b321e11f6b510e244cf7ed37de15e895976b44a4d69f71e7f70e8bcbdb52c5eb
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 10788 bytes
SHA-256: 654b32cedb45c307cfcb2c894cb149059be634c0224e2b06b3d35fe28d83cbb7
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f