Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7342cb31e00d1a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 22:50:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 79266c6e999c71c6ef094224f82d90e1 SHA-1: 39542af0e0bb7521de31be641c28bdb77298253c SHA-256: 1b7342cb31e00d1a451df45e13f6c8c279c4e3813ec499a982fb311aa6d02d45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9989

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=cara+menggunakan+avometer+analog+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fd74a154de82.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/ihiagdo/fnaf_piano_tiles_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6013a545a4d57.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/idDijha/pilexalinivesipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6049bd44e2e7a.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/21467325850.pdfIn PDF document text
    • https://cdn.sqhk.co/terexugureto/mgijfif/74677947235.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/gcijjgx/north_star_mall_stores_hiring.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/ja7Nmhb/basketball_championship_rings_for_sale.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://uploads.strikinglycdn.com/files/3459f5cf-c32b-4eba-aaac-dcabba8ae88c/12839960666.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ba4a09d10c7749a8a2c0689bced58c8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musokejixami/batman_hd_1080p_wallpaper.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_1098756d412445d1ad420dc8f7729bac.pdf?index=trueIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_a693e0c73173405db6da417708fbdee7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/car_log_book_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b515e1-a3d4-4685-a261-dfecd0b70ad6/bionic_gear_bag_tutorial.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_bbe14754713746049b45ab077e7403c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/photosynthesis_and_cellular_respiration_test_review_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/are_there_any_recalls_on_the_2018_subaru_forester.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/sequence_formulas.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_0ec7663913ce4fce94aa183a5c4dc3d7.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/aldehydes_and_ketones_multiple_choice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/45812798007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1104fee2-de68-4de2-8d25-92d4173aa264/iso_9001_internal_auditor_training_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3f3f60-122d-48e0-b7f0-60370612e357/sezuzetibumovaliled.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 5164 bytes
SHA-256: c905b4a63bb13d483b468ef79dc04516704bdb382f8b39d4a0c54ded6b710fee
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10384 bytes
SHA-256: c47289101819386f31724bbb2eace1ba350651ff300088a26abd23ad29421f04
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3