Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4752371d2ac8ae…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 02:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4794a036a915b34a7044f7e32d053223 SHA-1: 539256b9ee5f42288632b093bf4ce73c860b382f SHA-256: 2b4752371d2ac8ae52c3ed6c8585caf6510e6c917c618c7d8d7b71842d58a07a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains keywords related to sales, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=manual+sewing+machine+cebu+for+sale PDF link annotation
    • http://pixidilivutep.medianewsonline.com/what_does_technical_drawing_meaning.pdfIn PDF document text
    • http://jiviruke.iblogger.org/83202105773.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/20651537401.pdfIn PDF document text
    • http://toladidiripe.iblogger.org/why_is_my_wii_light_red.pdfIn PDF document text
    • http://white-x.fun/zojasijuwata1bzxq.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/watafal.pdfIn PDF document text
    • http://submonster.xyz/everstart_jump_starter_750_amp_not_charging3j5x0.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/chemical_bonding_a_level_chemistry_notes.pdfIn PDF document text
    • http://frankkyko.com/super_pang_original_online_game728zd.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/assemblage_de_charpente_bois.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/5d10cb90-163e-48c7-bed9-2fc58952079d/sistema_endocrino_concepto_y_funcion.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_d21a3cf188dc4efcbcbc5fc4c6b6fcbf.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_6a2a24e7c2d64c4987fec52fc9702706.pdf?index=trueIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_1efb548618a848389d4f992323c37037.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_db89a60c05e24cd0a853d0ec0326d24d.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_33f7a9dc6f484ca9bc6a486d67859392.pdf?index=trueIn PDF document text
    • http://jozadedosirokeb.rf.gd/logic_circuit_simulator_free.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_03fc16fb9b3f44e8ba202b5e6c047e40.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_bf8d80ef84214065a0d0d6c0083a3f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7fe71d-8125-4656-a295-f08a3d5c3a0c/gupizafevesaxunuvemodo.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/the_silence_of_the_lambs_book_synopsis.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_c1df3671fb7e46119c693b8911b2a70e.pdf?index=trueIn 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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 5532 bytes
SHA-256: 3b95e6e07341c07d6677f1b86ef5363082687001bd6e6d3a3bfe052bdc582f31
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 10528 bytes
SHA-256: e226b6be946eb9d3986cbb879a258483687a6f3b8985076787bc5dd5281fec52

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