Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb8ac1daf20bae0…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 06:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e0cbcf2ba2adb9e03c5ac55de42d673 SHA-1: 273ece4e5416c133cacc2c2871ad5d0b91142f9a SHA-256: 4fb8ac1daf20bae0480f68b178bc099c6be290520b15cf6a34c76b3018a35aa5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=solution+attendance+management+manual PDF link annotation
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/nutav.pdfIn PDF document text
    • http://importants.space/kozerimublg576.pdfIn PDF document text
    • http://retys.fun/31315264099vq60e.pdfIn PDF document text
    • http://dorightunion.com/adoration_prayer_book57x09.pdfIn PDF document text
    • http://tugrull.com/87713347685bewe4.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/tegumekok.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/8063745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44c1618-6e34-4376-ba70-b67896c750c3/what_lenses_fit_nikon_d5100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0ec999-5343-40f1-b833-efdb60cd94d8/parisizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96444402-cba4-4e06-91f6-05c265657125/how_to_do_a_tankless_water_heater_flush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee13b49-0a37-42a6-b7f7-9bfa49eb653e/is_breaking_bad_movie_on_canadian_netflix.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_81550a1132a543b389673c682f01d6a8.pdf?index=trueIn PDF document text
    • http://xemunebo.atwebpages.com/berolotufewebolepebewag.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_41441284c0ee42c3a0dee80d31ac8ea1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f541f1d9-3df9-49e8-87ad-1dc0e35e3bc4/7_basic_tai_chi_exercises_for_seniors.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_2be4b623db19427686b026503e6b825c.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/getipexuxuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54de0dab-430a-4a41-8c9b-d40a12e99aaa/77223046994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a374dd97-2daf-400c-9bcd-514a4fd6ea89/what_is_the_most_popular_love_song_ever.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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 5088 bytes
SHA-256: f5a0d560f7b06aa96767e92590a5bd1b41e4728d56fbe753c1eba12924225379
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 11292 bytes
SHA-256: a0868def2b409fffbd2e0f15c0fe9a83494df3bf914c78880ee0566b2cbff0ea

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