Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eab8a490065a79…

MALICIOUS

PDF

69.5 KB Created: 2021-03-21 08:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 36484744519df6412bf2bacc24c802c1 SHA-1: f1b787b1f6d311688941d597f3fb9f883ad6f753 SHA-256: 97eab8a490065a798ae2dbd728132d528d2ccc9a60a038e8a389836786675a09
126 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains numerous embedded URLs and is structured as a link farm. The document body, though heavily obfuscated, suggests a lure related to Coursera programming assignments. The presence of many external links, including one identified as a link farm, indicates a likely attempt to redirect users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://greatholl.com/cbse_6th_class_maths_textbook_solutions_chapter_3p05er.pdf In PDF document text
    • http://hookup755.fun/delonghi_primadonna_leaking_water_underneath6kz3n.pdfIn PDF document text
    • http://italywow.pro/jofidobilomikd4qpt.pdfIn PDF document text
    • http://jazulivorif.iblogger.org/fazimiwezosigimaxetamozop.pdfIn PDF document text
    • http://linogozajasupe.22web.org/comment_modifier_un_template_html5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=coursera%20r%20programming%20week%202%20assignment%20part%203PDF link annotation
    • http://tufudunokejuw.epizy.com/samsung_tablet_stuck_in_demo_mode.pdfIn PDF document text
    • http://firiveperoju.epizy.com/79434199289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37617f6c-81fa-42a7-bf49-0a69e861d215/tuzixezolimefaloj.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_3a5d4977ae3a45e2a8584f2dbddc87aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af5e63f-5512-4624-8f05-9913f3566bb9/61017529934.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/wuxawuxapiwedapitilop.pdfIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_f883177c5185401da72adeaf2cb150b8.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_8d560a31fb9d43e19f400f97a475d41f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/how_to_calculate_the_enthalpy_change_of_a_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/76637331176.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_953d0764277348cab1a7ad00c540934b.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_774079a0b268462ca80d2b4af9b8a4b1.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_5ed39491742f48e5814c2ff7e83cf3dc.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_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 5464 bytes
SHA-256: 72788c7915c0c485081f7cd500a8fdbe38b25c906981b16103a4b04afb60c707
font_01_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10420 bytes
SHA-256: 9bbb7f6e609fdcf3a29c4f649cc34bee8d5d4ae1cc02610a5f2b97bffe41f456

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