Malicious PDF — malware analysis report

Static analysis result for SHA-256 1948abf0d25d0b3c…

MALICIOUS

PDF

88.2 KB Created: 2021-03-26 07:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 58df9a51cefa4a69f2998e444d82e875 SHA-1: 58bba8cd23e55ca18f672eb0de96f8c8f6d6cdad SHA-256: 1948abf0d25d0b3c63fbe9ebff72542d84ce6be93eb8871fbd9060c5d0430ca7
186 Risk Score

Malware Insights

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

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 0.9990

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://fokemale.ru/123?utm_term=computer+lab+inventory+management+system+project+report PDF link annotation
    • https://cdn.sqhk.co/woluzadeviv/plrIjcj/22425976608.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/fhbhbgf/bsnl_mobile_recharge_offers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/hCgfgig/amazon_prime_customer_service.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/lCDjh0I/10_pin_bowling_alley_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/Shhbhid/melody_definition_example.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/basic_english_grammar_book_1.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/effortless_english_drive.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/alderamin_on_the_sky_light_novel_volume_5.pdfIn PDF document text
    • http://weroserigo.22web.org/54634840190.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/08e85793-9746-4464-affc-a351bf879c5c/sports_illustrated_magazine_cover_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496aedef-db77-4672-af40-8d478bbf5d95/tikomepojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28acc3f5-6826-46ca-a6c8-4ba877556651/12270940941.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/48101006174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ec28b1-2d75-4ec0-bdec-3c5aefa82a60/37330989034.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_4e9c0563d522479d91f3721ed259dbbf.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_c23cbe4ddfbc4f1897a8cd9ca186f072.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a72abf-f3dd-4564-8eba-850735991419/xbox_one_controller_wired_walmart.pdfIn PDF document text
    • http://dumadanovoj.rf.gd/sijalanogemerufitur.pdfIn PDF document text
    • http://sonarubitexo.atwebpages.com/leworugabaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb61c63-e45a-467c-8856-1af6e5ce014b/57056460284.pdfIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_6ba91c8084644bcca08ab1f825f4358f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4a7286-7756-4bdf-aab9-e2bc7eee5a27/list_of_trigonometry_formulas_for_class_10.pdfIn PDF document text
    • http://wejofofufaxut.epizy.com/emea_analytical_method_validation_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 5536 bytes
SHA-256: e5e08889e497246eeb28cb3622c3e0fb238746c66429ad3fd5623405c05c1e71
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 10764 bytes
SHA-256: 630f517ed3cf37e66b1b0331f489379280ba52e5d096c962ed504c675e1ec682
font_02_sfnt_off00013daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAA 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848