Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11571c4f26bf4b7…

MALICIOUS

PDF

78.6 KB Created: 2021-03-07 06:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e99fa116eaf0de7b0b1785113aab4a61 SHA-1: 8d7c6eab92d8a3610798c1272b29c8bcac846994 SHA-256: a11571c4f26bf4b796da4a98d27596cf37fa8f90893bdf040ae6e06592853d9c
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 0.9993

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://bologen.ru/award?keyword=hp+laserjet+p4015n+driver+windows+7+32+bit PDF link annotation
    • http://technodom11.com/minecraft_survival_island_seeds_1.14.1srhm5.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/gavipewezowupimot.pdfIn PDF document text
    • https://nelolepi.weebly.com/uploads/1/3/4/3/134355236/baxexereweref_sizejufu_timexikeniren_ganuvevereti.pdfIn PDF document text
    • http://nasporte1.fun/kitchenaid_pasta_cookbooktdelb.pdfIn PDF document text
    • http://wgathering.org/lixukupuzwpo.pdfIn PDF document text
    • http://migriruy.ru/actor_who_played_baby_grinchmclkn.pdfIn PDF document text
    • http://clebohets.xyz/what_is_the_main_idea_behind_the_theory_of_mercantilism_answers.com1yu2v.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/what_is_the_structural_adaptation_of_a_female_lion.pdfIn PDF document text
    • http://viewcreditscore.info/givigusozikudazozaxotabuw00wd.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/3da9a90.pdfIn PDF document text
    • http://vutisonoj.sportsontheweb.net/45186260102.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/zikuxisugutoxelakexojel.pdfIn PDF document text
    • http://eglo.club/bombay_village_panchayat_act_1958k2qer.pdfIn PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/niburiloxilusulex.pdfIn PDF document text
    • http://sq11mini.com/le_bateau_de_monsieur_zouglouglou_peej1q9.pdfIn PDF document text
    • http://dreabling.online/wedevoruzokitodijule91bf4.pdfIn PDF document text
    • https://sujebufapu.weebly.com/uploads/1/3/1/3/131379792/wixip-nozazobovof-boxemalib.pdfIn PDF document text
    • http://flowerport.market/77785952937hz5wj.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/17752434881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_8c78d6a6c8aa42439e425f81fb8a4a1a.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_f3cecea5d56e4ca68b7d0f765309234e.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_8d7c38b7f98f49518354f83bdea09797.pdf?index=trueIn PDF document text
    • http://teluroluxeterez.myartsonline.com/how_to_register_protection_plan_home_depot.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_ad8d8c65e6f74fc193df310c6c0b9782.pdf?index=trueIn PDF document text
    • http://sopuvezek.rf.gd/video_compressor_mac.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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 6064 bytes
SHA-256: c742f702d4e815cdb74dfc167f65e89e6e7d59e694c97d9f619f45ee4b30dfbd
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 14296 bytes
SHA-256: 21e36f920b62c5158d3df8c68127bb42e08e073785ddecb9d27d75060c50ff88