Malicious PDF — malware analysis report

Static analysis result for SHA-256 906bf5e246370d2e…

MALICIOUS

PDF

87.2 KB Created: 2021-03-15 18:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4942a8b116f13b49de3bf2efc867b2a5 SHA-1: 7ea88161b6a32c0e8c1136502531400dc2912ce1 SHA-256: 906bf5e246370d2eaf7db109714cc378515eab4cf6a2693d4da8a621189b6850
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=flight+mode+mein+bhojpuri+song
    • https://cdn.sqhk.co/savunowudob/fjgkvhi/global_lending_services_payment.pdf
    • http://gemofesane.medianewsonline.com/towufe.pdf
    • http://gasurorir.sportsontheweb.net/2010_lexus_rx_350_consumer_reviews.pdf
    • http://vashmaster.info/50885192448l74h3.pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/gapaxev_mijuxiforobumut_webelolaw_punamifu.pdf
    • https://danisamotaroz.weebly.com/uploads/1/3/1/6/131606121/dopoli.pdf
    • https://wixotofipexux.weebly.com/uploads/1/3/5/4/135400714/zawiliw-sademoze.pdf
    • https://cdn.sqhk.co/xorilulog/jf8ifjc/knowledge_transfer_template_for_testing.pdf
    • http://emirofficialzm.com/how_to_say_primary_care_doctor_in_spanish1o6bt.pdf
    • http://mugedly.xyz/what_time_stock_market_will_open_todayx9xzu.pdf
    • https://karinerojefemof.weebly.com/uploads/1/3/0/7/130775135/d48bace8.pdf
    • https://xowonijateroz.weebly.com/uploads/1/3/1/3/131380337/0caec8d36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/334c5903-4a0a-481d-9aa9-e6d9c68de6f4/gluten_free_snack_recipes_uk.pdf
    • https://uploads.strikinglycdn.com/files/0f713ff6-205a-4d83-8360-ba9dd2590e10/34330852020.pdf
    • https://uploads.strikinglycdn.com/files/92cfaddd-f583-40aa-8b31-9609555b8146/92666510454.pdf
    • http://jomupaz.myartsonline.com/kokavefafilewobakogo.pdf
    • https://uploads.strikinglycdn.com/files/c66b003e-db3d-44f1-b9e4-2e25646dd835/fikuwawiruxux.pdf
    • https://uploads.strikinglycdn.com/files/526f5133-6abb-4d0a-ab11-161f3ee3b2d9/little_house_on_the_prairie_season_7_episode_2.pdf
    • https://uploads.strikinglycdn.com/files/20d9c01d-b176-4682-aeea-ff88fafe5ac4/30686569732.pdf
    • https://uploads.strikinglycdn.com/files/8ceb0cc8-400a-4595-9f76-eb1892aca50d/nuwunoziwewomixuge.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df46.bin
c34fc39580882771b3661f4b346659353caa0414a4bc61eba614668871d8b2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 5216 bytes
font_01_sfnt_off0000f0d7.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 3720 bytes
font_02_sfnt_off0000fc3a.bin
db283053392af433eab9adccde4885f18d9eeace7442980be2b2c1e1ea2f9cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 11180 bytes
font_03_sfnt_off00012250.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 4324 bytes
font_04_sfnt_off00013051.bin
a181c5542625e01ac29ca9d3354db302df1886337e23898314e1f22e87ad4c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 9836 bytes

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