Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c15ee7b12828da8…

MALICIOUS

PDF

84.5 KB Created: 2021-03-02 17:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 543bd123921501d4e3aff7e32fa45d4f SHA-1: d27e20a3ab751b5f4f758aa47dd6fc8791ad3268 SHA-256: 9c15ee7b12828da893834a502975b41c2d427f457fd82b514fc2694b9082bafc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

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://jottigo.ru/123?utm_term=casi+angeles+el+principito+libro+amazon PDF link annotation
    • http://rosutob.getenjoyment.net/ponapujetanam.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/vufupaj.pdfIn PDF document text
    • https://kodirovotosin.weebly.com/uploads/1/3/2/8/132814250/tulilakovogi_tagugekikolax.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Giaijia/super_smash_bros_adventure_dragon.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/safubiratuv.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/togumak.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/ei52jga/best_budget_portable_music_player_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/f6hbLhh/jovukemilu.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/nikon_dx_afs_nikkor_18-55mm.pdfIn PDF document text
    • https://cdn.sqhk.co/sabeludejem/roCOgeW/gta_5_cheats_ps4_unlimited_money_cell_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/aRBhija/toca_life_neighborhood_free_download_apk.pdfIn PDF document text
    • http://poroda.site/67917472171ftbf7.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/fSMnLS1/viking_voyager_lego.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/buaihjh/paduwot.pdfIn PDF document text
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/wurolap_rulir_wokuzasa.pdfIn PDF document text
    • http://feelslike35.com/madorazirjayob.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://nejesezape.myartsonline.com/unix_shell_scripting_programs_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/ncert_english_guide_book_for_class_6.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/how_long_do_viking_ovens_last.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/american_dreamer_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/poison_oak_tree_information.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_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 5256 bytes
SHA-256: 7c791b3a71ad4801eb7fb914e5c3d8204be19d4a7df594f76fda558493d5fa94
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 12148 bytes
SHA-256: c2a68117be0b7946e3894c4a7c01f450a4a565b4758b453a2cde7ce0d017f47c
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34