Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe449317e721b6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 13:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9ce414c342e1892ccee4a8e32d680bb3 SHA-1: d8bdc092b132700c86e79535b5cdf6195086061f SHA-256: 53fe449317e721b62cb37e9e0e2915db58fec5e217584514cc6f5503d22bc944
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 0.9991

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://fokemale.ru/strik?utm_term=just+2+words+puzzle+answers PDF link annotation
    • http://gepexoliv.medianewsonline.com/basic_electrical_engineering_course_online.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/xadopuwaleba.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/how_to_watch_harry_potter_on_prime_video.pdfIn PDF document text
    • http://prod-fruit.space/3ds_max_2018_arnold_ambient_occlusions1trg.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/verizon_voice_remote_volume_not_working.pdfIn PDF document text
    • http://aycotoro0.xyz/apc_smart_ups_rt_2200_manualhg9e7.pdfIn PDF document text
    • http://baugroup.info/shadow_of_war_running_slow7yqa4.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/yamaha_ovation_service_manual8988p.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_are_marketing_strategy_process.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/77732923057.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/simoriv.pdfIn PDF document text
    • http://best-store.club/price_of_lexus_gx_460_in_omanpa2hy.pdfIn PDF document text
    • http://memisada.mygamesonline.org/spectra_s1_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e42da4-1ede-42ff-bc4c-b5ad8841c5ed/what_is_a_digital_tv_tuner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c26cd25-7814-4434-8886-0421b8d77f18/xilitezubezitomixokogomur.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_4cda818bee034b6ca16d9e0beda1b5f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71794133-cad7-4f4a-bc88-d3104190d153/freed_fifty_shades_darker_as_told_by_christian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fdf679-6ff8-4dea-bacd-6d5857aa46ff/33458116547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f71306-8f2e-49f0-8c94-a0e516d98a80/the_walking_dead_comic_issue_117.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_6a2ffd06ebab40b88dcbe2ffe6e6b4d1.pdf?index=trueIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_9f05419c67a54518bfb2a27d1e09b09b.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_fbad415c28d24d50b4c29b71d30ba7ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db07da0-9a0a-4371-8ac1-8d0aa02eb2a7/washington_redskins_new_name_suggestions.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_fc17cbc4a5134d2c86592fb66ac8c94a.pdf?index=trueIn 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 5216 bytes
SHA-256: 0dae3e8fe8a2abd2c6eda20c92a25ba8c205acf053237cb6962efcbeff146ed3
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 10580 bytes
SHA-256: b1898ea24376b9420b4d1e2053d17c17586630838aba6a924440c9ababaea6ce