Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e541afc595674d…

MALICIOUS

PDF

96.9 KB Created: 2021-03-14 19:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf316c52df74fab10c625a6613d28675 SHA-1: 9a56b5a77caec99c67af98c9dc5cd771c0dac9f3 SHA-256: e7e541afc595674d33e0e91f2a556539a716075757cf4db297c5086f5d4110e3
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were directly extracted, the PDF structure and heuristic firings point towards an attempt to manipulate search engine results or redirect users to malicious content.

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://leonvi.ru/award?keyword=introduction+to+ruby+programming+language+pdf PDF link annotation
    • http://leree6.club/mr_coffee_iced_coffee_maker_how_to_usep8th8.pdfIn PDF document text
    • https://cdn.sqhk.co/xijodepub/jcif4nT/pinball_arcade_ps4_disc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602c1f78b25f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_60354d2184376.pdfIn PDF document text
    • http://pitushok.fun/how_to_connect_yamaha_rx-v371_to_tvnhdk5.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ihgdhai/free_video_call_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/faBwjcr/bally_star_trek_pinball_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/lCu8vhi/best_pick_up_truck_uk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/LhdAoic/freeway_honda_al_service_coupons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5fd72a323787a.pdfIn PDF document text
    • https://cdn.sqhk.co/ginijetemepa/gj8hijb/67506727766.pdfIn PDF document text
    • http://itclick.info/what_is_an_explanatory_essay_examplenac6p.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/g5hche3/99994502925.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/Ajeuviz/18481123898.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/K9J9ehf/sacrifices_must_be_made_steam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felugibesixe.onlinewebshop.net/xudimuvap.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/pubanoregigiviwu.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_9f47a47f8d3243ce9d91ceb1d6d76e6e.pdf?index=trueIn PDF document text
    • https://c17b5239-463d-4501-b432-c779fc8f8112.filesusr.com/ugd/c068f8_f14396a303c14d7c843b83d7702cea7a.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_019d9b96eacf432b91675fa17464bbaf.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_32d700ad67be4b65891b606831c60271.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 4016 bytes
SHA-256: f7544b7057002509627d79a0531fb86ca0cd48fffeb7f7b8d35770204cce26ee
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 5476 bytes
SHA-256: f98a364fc91bc99db4bf06bd34613c585bfd7c327bd55aab6f49db78525b417a
font_02_sfnt_off00013811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13811 11612 bytes
SHA-256: 999bc682239e997477b2732d2806b11dfab537c2f0667af3abf61ff6e7fc2378
font_03_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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