Malicious PDF — malware analysis report

Static analysis result for SHA-256 c548d58fb237e05f…

MALICIOUS

PDF

83.4 KB Created: 2021-06-07 02:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5abf15035927f0817d11e6bd2dd517c9 SHA-1: df4e98f90b79bad775190fb6fc7ae6ad92d0db64 SHA-256: c548d58fb237e05ff56940190efc31fbeb4a92b4df08a39f08411adfcdc6bd36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('irlanc.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting a malicious intent to obscure the true destination or to generate traffic for malicious purposes. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/pbw?utm_term=tower+defense+mod+apk+com2us+offline PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duriwug.pbworks.com/f/yugioh_legacy_of_the_duelist_link_evolution_deck_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65da755-0570-4f3c-a19d-bc8c39f8ae84/Guardian_Home_Services_Ivy_Bush_Court_Reston_VA.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/43962620674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87194f1c-c631-4bec-801f-5545a7f27cce/m-audio_fast_track_ultra_8r_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b897e41-55a8-4104-a705-be790c45290b/dark_souls_2_bosses_in_order_of_difficulty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f437d3f-c77b-4602-ba0f-772c7db2cc21/what_caused_japan_to_invade_manchuria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1425674-c171-479c-bd7f-9a48b2910a9d/terujupit.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/w/file/fetch/144523131/god_live_wallpaper_for_android_mobile_free_download.pdfIn PDF document text
    • http://malamojozag.pbworks.com/f/93012014106.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/how_to_get_free_vc_locker_codes.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/saaho_full_movie_hd_hindi_download_filmywap.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/your_first_year_in_network_marketing.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144667353/permutation_and_combination_example_problems_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eabc91b-f3b8-4edf-a180-fd5af8423b11/14056115839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404e0e07-b5ac-442a-925f-73975ab09db2/jafaziburabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165a9b30-bc2a-47c2-b914-d7b28912a997/99640512271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135ce8ba-ff96-4786-b699-0db1c97075b4/71886098549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd9fcbf-b544-4c7b-b3ea-acd0a385aa41/xuwogokubopeterofabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8c06f4-dd1f-43ab-8be0-dce1b18beab8/41226667508.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/how_to_unblock_caller_on_panasonic_home_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e443e18e-91ee-4429-acb0-f4bc70a59f84/poremowiwunud.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/fantastic_beasts_and_where_to_find_them_movies_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42434e2d-3f73-4b97-9cd1-48a5362cbc71/hp_elitebook_2740p_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 5120 bytes
SHA-256: 798494877d00ddec0b1a0a3634c3dab19eb3a273217799d443de7b408e985ea5
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 5540 bytes
SHA-256: 56d24dc6f06bd5ec977b2df5f96b2f6594454d4dd89ecb5536200d27c9661973
font_02_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 11360 bytes
SHA-256: ec92296d490f3cdb518ded5306f34b0a7bfd6c11b049c9dd3f7efab64d9ff84e
font_03_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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