Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e263f3809e53a0…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 16:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 424056d1d1c6b435ac57eec363f71f20 SHA-1: f99e4849fab5bccf9d98d11fb607b7504c4092bd SHA-256: 08e263f3809e53a080e1b3d61ba32e33f787e8ab171a45d97ffa06fed44215d8
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of links hosted on potentially disposable domains, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/award?keyword=ansi+c+pdf+balaguruswamy PDF link annotation
    • https://cdn.sqhk.co/pobumepova/id1uZgj/lemonade_recipe_with_lemon_concentrate.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/memopinowofuwasijo.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/counting_numbers_worksheet_for_kindergarten.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/beginner_crossfit_workouts.pdfIn PDF document text
    • https://cdn.sqhk.co/zivudasexoni/UPueWKz/64792637873.pdfIn PDF document text
    • http://neletaparufo.scienceontheweb.net/32752598632.pdfIn PDF document text
    • http://bukipumil.mypressonline.com/woxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/bgjzgcA/arcade_fighting_games_play_online.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/488d5fdf-37c2-4a58-b87e-1a49a1bcdc4e/what_is_the_message_of_the_blind_side_movie.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_0e268e4298b9406cbef938373664970e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e14efa-4129-49c7-a925-7019cd4524a8/neviwodipevolatanunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16af8dca-dd82-4794-84fe-0b1030edfaf3/37986533564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e4dcce0-84c9-497e-9aef-ba891dbd8e80/dewogizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85b9ec2-b541-4675-849f-645ea38efba7/wumugevekero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff0f06-960e-4bad-9d28-34cc7f306055/how_to_fourier_transform_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49113e8-d4a2-4ca8-8e76-d6dabe1a0a3f/difezetikirigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4a10b2-3b01-4865-addd-cf8bc71b999b/motorola_talkabout_t465_manual.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_98acf6564d3347d99647da76328f8b0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f6f03c-734f-478b-9ab1-e8018f471e53/86248812198.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_3d16ffb3477845389cf9b0a9369d9d09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/615e4007-3774-4e75-9437-0e3a05b61fac/apple_iphone_5c_launch_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d2a0e2-a0f8-4dd2-a6c7-c11232a1699a/how_to_get_tested_for_sleep_apnea_uk.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_off0000d9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C4 5796 bytes
SHA-256: 5e6fe14a4b538f47dd87c78d54875748d8a8e91d41e1aec71f4d625b9f01ad29
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 10524 bytes
SHA-256: 8152d61d104c3628416631c5f53768b7acedaf61d4a80bacfb963e8cfed78218