Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf86bdc7a88974e…

MALICIOUS

PDF

72.4 KB Created: 2021-01-19 05:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3f915aebbbc11e4fa9f2704b18a6ee1e SHA-1: 551ad0108dfe42110a0dcf35fa384569500b7426 SHA-256: aaf86bdc7a88974ea0a52f1916fc7bbd423901a82ddc36c255bcdd71f1d00827
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 0.9997

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://jottigo.ru/123?utm_term=microbiology+made+ridiculously+simple+7th+edition+pdf+free+download PDF link annotation
    • https://sofupikibir.weebly.com/uploads/1/3/5/3/135302021/nemerajilivi-tejebijezufej.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/ijXijWa/47132120253.pdfIn PDF document text
    • https://kelipibefis.weebly.com/uploads/1/3/4/5/134500531/wuwopura.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/mixiw_wizabiviloma_wogigifimu.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/ieierjc/xovavugadezagakutejav.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9FiaBFk/18485365080.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/hcwyhdO/50321893470.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/puwozararuninikakum.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/iR0Yejf/cricket_live_video_match_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/jeihhb5/father_drowned_crossing_border.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/bWxqLhe/bewiponiriton.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/visuda-sarigow-zibinasoxinini-juxuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/cjgbPgj/50_in_1.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/nomejag-wibomuregelu-mijozupo.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/ghjfGia/39282137873.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/7ELggge/paregegid.pdfIn PDF document text
    • http://japadalifu.22web.org/home_dream_puzzle_game_answers.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://mizadebep.rf.gd/magus_pathfinder_guide_kensai.pdfIn PDF document text
    • http://biledimetiwen.epizy.com/44557548506.pdfIn PDF document text
    • http://vububogux.epizy.com/kufivosirukudejefamob.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_off0000cda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA6 5872 bytes
SHA-256: 40b4a7336198230b9090835e690fa6bfbf527e628760cf680db6cfcf59ea2bd9
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 10472 bytes
SHA-256: 57fa96cdcb42e8d3691d38e8ea627c9c73614453ca5a4d3680a45d3a4d0d87e3
font_02_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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