Malicious PDF — malware analysis report

Static analysis result for SHA-256 63119cc6a9980f40…

MALICIOUS

PDF

79.3 KB Created: 2021-03-05 22:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 614cd59950fd56c752bcc5a339818782 SHA-1: 494e46cfea13da005a1739501cb60ea1fe86fd0c SHA-256: 63119cc6a9980f4024578985d8a56eb86da5e305700076043bbd1bba1dea4910
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'golowaki.ru' which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to redirect users, likely to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/wix?keyword=naming+chemical+compounds+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/takularozo/aDhaijF/zoxutif.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/sha6jjb/4210954305.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/03ee8d5bf8.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/xawimowilit.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/J4pzgfW/hourly_weather_apple_valley_minnesota.pdfIn PDF document text
    • https://vufoduvetuf.weebly.com/uploads/1/3/5/3/135302170/7930771.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/jBibdEz/stone_craft_new_crafting_2020_game_apk.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/b02ec36e.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/d006e1a7c9f0b2.pdfIn PDF document text
    • http://konolux.medianewsonline.com/37418614021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosimamasi.epizy.com/vifebupigasikifeweb.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/batch_er_chrome_extension.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/78945371220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9233cd94-425c-47ef-94ea-94ae1395e4a1/visonigigabisixi.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/why_does_the_first_harry_potter_book_have_two_different_names.pdfIn PDF document text
    • http://vefobop.epizy.com/456579237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d103ac-e265-42c6-a7ae-fc0a0c62132d/22329850444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a8b828-1328-4d12-8768-b4d6b71aadf2/36184624469.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/bafazasobugevesupudepiloj.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/bepamof.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/81545434381.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/what_do_you_mean_by_bill_of_exchange_payable_on_demand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55906ea0-b103-4aa4-a84e-70d131c6eac8/idioms_worksheet_with_answers.pdfIn PDF document text
    • http://sufumawug.epizy.com/zivulo.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/vovibapidumememizoneva.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 5712 bytes
SHA-256: 5f7b187b8d91f30a3500602ea1b7a73201f8a997aa3d52a207c8c7c6fa0c6a3c
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10552 bytes
SHA-256: a520c5407589105747a4afdb13d6321d57839c20985d98c8ab62e6f0a1829d35

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