Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d57b8c1ad8430f8…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 03:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0082c5dff84bc0b32f1a6ed856df8de7 SHA-1: 97b0480f4c8216396e8e4efdf21ed5bf29071785 SHA-256: 7d57b8c1ad8430f8f065bb82fa1306c3a81cea9e99cd99589245e84a73a83622
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://bologen.ru/123?utm_term=filmywap+war+full+movie PDF link annotation
    • http://pearhaidhr.fun/78936705945c3hzr.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/calendar_2020_malaysia_download.pdfIn PDF document text
    • http://uose.xyz/tc_helicon_mic_mechanic_1_reviewv206s.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/sepejadujaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fevobelijogal/30438839812.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_a18fb0e02d334c20b44266abddc73831.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fefaafe-3b49-444a-a10b-6d8cfd0d6aca/74536449901.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/antique_radio_value_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/joribik.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/upgrade_windows_7_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dc3fba-1ee7-4111-9831-690700970547/mbti_personality_test_results_analysis.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_8ec0ae6d94074d088b8a7ae6641307dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9f9e02-e3b0-4de7-a373-ea5b920a3a55/bifisuzisudefovuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1725d1b5-7bf1-4289-a68e-a2de1a4b0e84/the_little_red_hen_story_slideshare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c44868-40cd-449c-9f96-e096da84d751/72348863624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1babdca-794f-428c-88cb-5fd7529cd67e/cheats_for_gta_5_ps3_lamborghini.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_ef455b14926a4da1aff19981f8a13b30.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 4776 bytes
SHA-256: 9e5b0916d6f804eb2da2f39de66e1b5c79d494038578b0a4116f7db10ecf64b9
font_01_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 11592 bytes
SHA-256: 5234a8570c3a870f79113aba948ff5129b1087e2dd8ffe4d40ba999f2d5ed019
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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