Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a311809d47f30d…

MALICIOUS

PDF

110.7 KB Created: 2021-03-19 13:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c52d3e7eeeb99629bc75acfe7676119 SHA-1: 70ce99d03d2e16c8b7288bb764aa3ba3c3081aba SHA-256: e3a311809d47f30d44d3b456199e8684658bb11b60b1c76b6af6ee0e41be5d75
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, indicating a link farm or phishing attempt. The presence of PDF_SEO_LINK_FARM heuristic suggests the PDF is designed to redirect users to numerous other PDF documents hosted on various domains. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=onerepublic+counting+stars+song
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/9066443.pdf
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/vufexadawi.pdf
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/6307217.pdf
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/670402.pdf
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/8ab9296e.pdf
    • http://zajapokel.22web.org/43393747053.pdf
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/5de1154e6e1af.pdf
    • http://xixutajuk.22web.org/carol_of_the_bells_guitar_tab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1cb988bc-0d03-4fd7-833f-79962f0fa120/which_of_the_following_represents_electron_configuration_that_violates_the_pauli_exclusion_principle.pdf
    • https://s3.amazonaws.com/pubopelej/nothing_like_us_justin_bieber.pdf
    • https://s3.amazonaws.com/defujo/descargar_animoto_pro_apk.pdf
    • https://s3.amazonaws.com/kavalukato/rt-n66r_login_password.pdf
    • http://nupatugo.epizy.com/blood_bowl_2020_date_de_sortie.pdf
    • https://uploads.strikinglycdn.com/files/f2978651-658a-4e43-bcfb-b89a6c8a52ef/9861622804.pdf
    • https://uploads.strikinglycdn.com/files/725188d0-2c48-4e0c-a0a6-4a563f1145a3/study_skills_high_school.pdf
    • http://wilixafex.epizy.com/how_many_pages_in_the_hunger_games.pdf
    • http://wosemas.rf.gd/jesus_storybook_bible_lesson_1.pdf
    • http://liramovabo.epizy.com/force_table_lab_answers.pdf
    • https://s3.amazonaws.com/dukexajuj/78677750979.pdf
    • https://s3.amazonaws.com/sixenogafopoj/48456653031.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f94.bin
00cd08e584cd1d7a0c2a5430164237677dce30a9847a3a51d905fbe784099d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 5148 bytes
font_01_sfnt_off0001711b.bin
f53fc037f9b2c155164d6fdc0538e4cdf650a64d81815c38485c0b7e63d0a9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1711B 14620 bytes
font_02_sfnt_off00019e94.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E94 4324 bytes

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