Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b89d42d2ca3f59…

MALICIOUS

PDF

73.8 KB Created: 2021-06-07 11:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3d546d7ad3058609d205b28a44d0dc0a SHA-1: afbb3cd89a5749e982b4e6d8119e253b13cbe043 SHA-256: 75b89d42d2ca3f594dc6d79ce5681110642fdec6d837456402bb1ebe30e90e6e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, and one directly to 'irlanc.ru'. The document body, though heavily obfuscated, suggests a lure related to literary analysis, which is likely a pretext to drive users to malicious sites. No scripts were extracted, but the PDF structure and URL distribution strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=que+son+recursos+literarios+de+un+poema PDF link annotation
    • https://jisixeda.weebly.com/uploads/1/3/1/4/131409884/6827385.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/2355716.pdfIn PDF document text
    • https://bojumojomugo.weebly.com/uploads/1/3/4/8/134850871/5105633.pdfIn PDF document text
    • https://lodetisider.weebly.com/uploads/1/3/4/7/134732723/afc49a96a4bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6016444a11338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_6033803e8d834.pdfIn PDF document text
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/tadiragogepi_fitosonubo_geriforeneletab_sikif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6049c014b5aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_604ccf7d9cd23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413474/normal_5fe47eaed6cac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601d5c3438c45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144769794/win_the_white_house_pre_game_activity_answers.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/w/file/fetch/144617775/97532347838.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/f/how_do_you_do_ultrasonic_cavitation_at_home.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/audi_a4_b7_service_manual_free_download.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/20771765281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b876f36-375a-4daf-af33-7a108d392572/59859739305.pdfIn PDF document text
    • http://zulamiz.pbworks.com/f/39700474470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac45140-7510-4a4c-a0d1-961106f011d6/zofupewixezewadusotivevag.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/duwojotaniporujufali.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144415353/accounts_payable_interview_questions_in_wipro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6cd27e-de66-4935-a280-8b30630a49fe/yellow_curry_cozy_thai_seaside_or.pdfIn 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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5280 bytes
SHA-256: 2c977b6f2d6a5bc8764dac9c07068f7a8a09c9695d8551b63f67e6aff2d2e4a8
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 12672 bytes
SHA-256: 7cec3bc943ffdb10133d237ccb6bf84852d93affbf83d586c7547b5b512d811c

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