Malicious PDF — malware analysis report

Static analysis result for SHA-256 b785ff0c374552f6…

MALICIOUS

PDF

97.3 KB Created: 2021-03-14 04:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 71be74d5f0f374708435a3831fbe29fb SHA-1: 88d812c3d546df7c96b331239c95115bf2935ff5 SHA-256: b785ff0c374552f64cca1949e373d6ce59be6d990290d34931e34a6731b116d5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with malicious activity. The document body, though heavily obfuscated, appears to be a lure related to tenancy agreements, intended to drive users to the malicious URL. No scripts were extracted, but the PDF structure and numerous external links suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=are+12+month+tenancy+agreements+legal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdd3118da88b.pdfIn PDF document text
    • http://detonic-shop.website/how_many_pages_are_there_in_pretty_little_liarsh1np9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_600c7ce24a4a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_60017cab2bd97.pdfIn PDF document text
    • http://tryplafond.xyz/artistic_anatomy_freen7s5x.pdfIn PDF document text
    • http://chategratis.online/which_is_an_example_of_a_narrative_poem_apexxx6wk.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/11th_std_zoology_practical_manual.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/kigerosugatirufavonezal4fs.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/nifewaxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fcd425b6b31a.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/fourth_grade_fluency_passages_with_word_count.pdfIn PDF document text
    • http://snegny.com/35005972115dssc6.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/15400828462.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/bf22301d-1ae9-4ef8-96f3-db7ca3af5cdc/sct_livewire_ts_6.0_fuel_pressure.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/jenkins_plugin_.net_core.pdfIn PDF document text
    • http://polilofu.onlinewebshop.net/sony_hdr_as100v_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875b46c2-e7c2-4ace-844f-d748606b636a/how_to_test_residential_electrical_wiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce90b35-66f9-4e75-b155-ebc95c434a27/is_timex_a_cheap_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd0d899-4f0f-4081-ac2c-8f03f85909c1/harman_pellet_stove_status_light_blinking_2_times.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/pdf_split_and_merge_offline_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548416b6-97c5-474e-96b9-20436b7838c1/sansa_fuze_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b720c7-e060-4c1b-9cb4-599c4b2802f7/kelukoxuranidejoboperup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e0fc54-9d93-48e8-9bce-f33959779612/ratoxubikuzopuku.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/34892700428.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/riwika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c1e94a-23ba-4a1e-82a6-6aa3a4bfb218/is_nikon_d3100_good_for_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ffc759a-c0e8-4912-89de-54f6dd478ecd/pasurapakijikufizawe.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_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 5488 bytes
SHA-256: f22a5851c691ba79e47d5e897b190923bedef93f5c0cd12be2f4d382c35eb1a5
font_01_sfnt_off00014e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 11736 bytes
SHA-256: 1f0af86cd8bba2d2584e224f864bf3febb1fd14fbada198c607906aa9af57cc5