Malicious PDF — malware analysis report

Static analysis result for SHA-256 596b5ece9b2ea4ca…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 22:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8c7e44e31010d16599b44ed6291c63 SHA-1: dc19b056ab28230f23591b65f19a4c379aa7db92 SHA-256: 596b5ece9b2ea4ca56e09c1e8e5eb516fd7175fbb5702662b02be887f6d30b4a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as benign resources related to Excel formatting. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary malicious URL identified is https://pelibifir.ru/123?utm_term=excel+weekday+month+day+year+format, which is likely used for phishing or to serve a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/123?utm_term=excel+weekday+month+day+year+format
    • http://betegozoneseje.iblogger.org/aws_cwi_practice_test_questions.pdf
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/fejekajuferoxulas.pdf
    • https://bovojopo.weebly.com/uploads/1/3/2/3/132302970/2b96b.pdf
    • http://juvivufokif.22web.org/woterefewugibo.pdf
    • https://rolobidixogiru.weebly.com/uploads/1/3/1/6/131637372/zozozanam-kofoloxozo-kabijokubuwa-tapebunu.pdf
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/37586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_87edcf943188456b93a82336fe1d21c3.pdf?index=true
    • http://vixoxuzet.epizy.com/kalam_cosmological_argument_meaning.pdf
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_b8988bd442b94b31945c981fe4e5d643.pdf?index=true
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_2d9d0089ec764078a6038bdc53cff1ef.pdf?index=true
    • http://tabejarobovo.rf.gd/how_do_i_learn_excel_formulas.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_9a0125ad410148e2ac34290be8e40644.pdf?index=true
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_71934a3bd48d4a0d922150cbacdd555d.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_8b85279b6af845189427f14051c923d2.pdf?index=true
    • http://ketanuviz.epizy.com/set_path_in_chrome_selenium.pdf
    • http://solatilexi.epizy.com/86701179491.pdf
    • http://zukivit.epizy.com/30294173945.pdf
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_236b378eb43f414597bdbb69dfd22343.pdf?index=true
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_8dd42f3118774230a0e4505246beafea.pdf?index=true
    • http://kakarares.epizy.com/dipimuv.pdf
    • http://bitugoxopezuwu.rf.gd/75983016943.pdf
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b4da8f3012d44be495735faf39a3c651.pdf?index=true
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_b12d7f50fa084676ab45ebf479a1dcf8.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_1fa96df659c94ca68a4e2891a6af5bf5.pdf?index=true
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_7b21562d24d547fd9b90b5dc2ff652ea.pdf?index=true
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_c64cfa4413cb4a79a60a6015ef3ded9a.pdf?index=true
    • 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_off0000f6db.bin
7e8ea2434e816fb3af39127a15e0862e3b7950e6f16900d2e022350990a26d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 5368 bytes
font_01_sfnt_off00010911.bin
f5c6e7f5526a95294ecd8b507c2578fe981b7df8d0af8b8d45fbf569ce424cbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 11612 bytes

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