Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bcc94af67a7a2e…

MALICIOUS

PDF

74.6 KB Created: 2021-04-05 13:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 524225e0d6846584c609dd3ad1b4038c SHA-1: 8746f173ac53dc78e3825ea21837761607eeb10a SHA-256: 50bcc94af67a7a2e1c4a83f90eb4a0d6e22bceb5f1d6b937363ebdbc2a63d370
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, many of which point to potentially malicious or suspicious domains, suggesting a link farm or SEO spamming tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=tarot+decks+for+sale+etsy
    • http://zezasarasojid.mywebcommunity.org/bernard_werber_les_fourmis.pdf
    • http://zixaxagewan.mypressonline.com/dowry_act_1961_in_marathi.pdf
    • http://tazikuruwuwozu.22web.org/contact_information_sheet_excel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c5dd20ce-f408-47f7-9d9c-8f228f7d4287/zinufodavalotit.pdf
    • https://uploads.strikinglycdn.com/files/9e13d087-51de-4019-8678-b59a44648259/6377230003.pdf
    • https://uploads.strikinglycdn.com/files/7cca7fd5-c114-4b3a-a0e9-5c82bf0f1c68/horse_drawing_for_kids.pdf
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_124d63f2374e4a0697b0c61be9eae073.pdf?index=true
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_2d76efeec63645e7b9a00466b0cc76c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/211638ea-5319-4f37-b796-68e9cce6af7b/mapilem.pdf
    • https://uploads.strikinglycdn.com/files/ffb04cb1-c69f-492b-85e4-3cd38bca1388/7864039887.pdf
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_3278ad8123e446d8bc0e22559315e958.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d146c92-87b7-4041-a98d-fc3ac14000a2/monster_island_buddies_episode_102.pdf
    • http://dazusiv.epizy.com/81220105653.pdf
    • http://kagumaxapa.rf.gd/zotoxox.pdf
    • http://sazoser.myartsonline.com/automotive_service_manager_resume.pdf
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_b7e827bd4c524928a975101433fccd6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3c0de111-0123-4916-86ad-069dd3822268/52690473476.pdf
    • https://uploads.strikinglycdn.com/files/95bb99a2-5a56-4702-b3b9-7bfef58b047b/bissell_powerforce_helix_turbo_bagless_vacuum_2190_belt.pdf
    • https://uploads.strikinglycdn.com/files/70a6902b-030f-471d-9dd4-6f2ee9e02f37/mobokigunofibabun.pdf
    • https://uploads.strikinglycdn.com/files/d19a4384-452f-48dc-9a55-e2b448abd538/how_to_get_started_in_hand_tool_woodworking.pdf
    • https://uploads.strikinglycdn.com/files/a0ee74cc-9fa2-4dd0-a3ca-1c60d3207f39/12683510326.pdf
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_c5d8872b6a1747b0ab87a8811d7f425f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb8e3291-3c0f-4105-bca3-947088dce1bf/how_to_get_a_software_job_in_canada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f1.bin
29d04da3be16c390a5e01d89d3f9ca8ec7cac365c7f7ea304fae8f0b2b3f39fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 5128 bytes
font_01_sfnt_off0000f583.bin
f6abbf88172ae87396034e2757dde2bd6ce962c49ba9856b94d600bddda74d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 11312 bytes

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