Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08a7e4f7fa7ab8e…

MALICIOUS

PDF

112.7 KB Created: 2021-05-10 09:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab5c1edb44ad76ce00a54515a905d753 SHA-1: 25d78234ab06a34c2df516a17baaca645514759a SHA-256: c08a7e4f7fa7ab8e92619b787dea4e5c6cdeeab504496084e164514ebc35fee3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded links and the nature of the heuristics point towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/strik?utm_term=what+are+the+characteristics+of+behavioral+objectives PDF link annotation
    • http://kopogaxepaku.sportsontheweb.net/60142113379.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/e6kD9yT/como_hacer_una_recarga_amigo_entretenimiento.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/ansys_fluent_cfd_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/dqk4hgA/lemonade_cleanse_recipe_for_one_day.pdfIn PDF document text
    • https://cdn.sqhk.co/gorigaserata/kmhjG0b/sokabizujiviwaworu.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/HbghWtC/certificate_of_good_standing_company_template.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/kU6Ahch/zombie_shooting_games_for_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mesirunomi/jggfTD6/scrap_copper_price_per_ounce.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/VicmjjA/dvd_player_netflix_hulu.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/rdk1Bhc/cadena_100_telefono_1000_euros.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/promet_split_vozni_red.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/physiology_ak_jain_free.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
    • https://s3.amazonaws.com/ladojenefe/why_does_my_oven_fan_keep_running.pdfIn PDF document text
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_6a6afa02bbfe4f969504a77d9f9e480e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8d0d75-cb96-4939-8e71-0d1ea0ff7d8e/ritchies_fabulae_faciles_51.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_b74c5b5d778a4ae681654c1f2310cf8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/bobunitokufowu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/alloys_chemistry_form_4_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4112c0-6dd2-43eb-adf0-de14b8a5a01c/doll_house_movie_download_in_hindi.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_452b173d43b74fdeb00907414cb73e67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/negevabikip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff74e573-68bc-4281-ab5b-e95bd37ebe24/how_to_watch_after_we_collided.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_9e33ec4687344420951cabcf2717f243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ba949a-2330-46ad-9d81-567d6198781e/80274743042.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_d799d72eb92f4b0f85b2048bd8a3ef94.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D13 4940 bytes
SHA-256: 1bc47515babe95b422b12fef8a2769aa31f4c8e312b6191b859829c9343ef3bb
font_01_sfnt_off00017e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E05 11892 bytes
SHA-256: 7947d09183ba5fa4674f57080268901882da8dce2c8b7bdfcc565f2ba54bbc7b
font_02_sfnt_off0001a62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A62C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176