Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99962f779d0653f…

MALICIOUS

PDF

84.0 KB Created: 2021-05-25 04:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11e00c02c4f86ac789c0a0667ec64e09 SHA-1: 1994b99d0d921f7721531f1ab84d2541598ac5be SHA-256: a99962f779d0653f39c2e9a5e3e99bcd3d6c6d54295ff620b8c28c421f44a873
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/strik?utm_term=persuasive+speech+topics+for+college+students+2017 PDF link annotation
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/redagowal.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/dolizajowubomobige.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/bf8c0045620.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/728309d.pdfIn PDF document text
    • https://kanevuto.weebly.com/uploads/1/3/4/4/134484588/kupeweva.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/rulasame_katiw_babav_kijut.pdfIn PDF document text
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/12c138ea377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedilegol/51752285306.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/ascension_parish_school_board_policy_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a54367-18de-4661-9ad3-aae118b8f9d3/rex_c100_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/zidinovizikagugerafonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58741b01-a741-420f-82ba-df9b7b2b9f7f/gepudabekeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/7th_grade_springboard_math_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cef04d-150a-435f-8821-ea01a66d6021/xosaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871ad7c3-c1dd-4a04-a681-d1cf8d13ea7c/nufanowib.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/cooperstown_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/guidelines_epilepsy_2018.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_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 5884 bytes
SHA-256: 9d174fcfe9b5ebcb51a8c54d22d242fa794e6ac85ea2a8e8f0a03d3e11fe491f
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10392 bytes
SHA-256: 7f9f55ebd33c11c41449ff39d8c341f0e914df9781af6c1fe46e07a517a684d1

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