Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e899c6e65af58d1…

MALICIOUS

PDF

81.4 KB Created: 2021-06-10 12:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 77347f0fffcedc81499605caf9308d26 SHA-1: 6885b018b9bdbbd7fd7e0e849bfcbf91f3ffda75 SHA-256: 0e899c6e65af58d110700553c87390c7e33ffce24034caea68e402a1cb4fa842
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, one of which, 'https://nomylo.ru/pbw?utm_term=download+vortex+cloud+gaming+mod+apk', is presented as a download link for software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute unwanted or harmful software. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nomylo.ru/pbw?utm_term=download+vortex+cloud+gaming+mod+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497646/normal_600159c958bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_600d0069e197c.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/a6bebd66-9442-4a9d-b4dc-5dc0ca00be59/presto_dualdaddy_deep_fryer_manual.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144434973/mexezoxupazi.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/f/36486214202.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144416769/pentatonic_chord_progression_piano.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/f/donufuwaruxipudidi.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/1488224563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfcae1d-82ac-4a5f-a9d2-b793e2f37f15/14727894289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67485dd0-8653-4e96-9ee0-e67719227496/hp_officejet_4500_scanner_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63dec89-8229-40a5-9e63-00e749da7de5/who_filed_ucc-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5991b1-13ac-4490-b3c0-a4a658f4927c/famufofadatat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fa1e2f-21c5-4441-8b3d-b1048ab110d8/53004512588.pdfIn PDF document text
    • http://menovokosi.pbworks.com/f/drake_and_josh_season_1_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef611a45-1f2a-4130-8eb5-08ccc774a69d/86852302832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0f80fe-1eb5-4264-810d-3c6fc15f1ff8/deleuze_difference_and_repetition_summary.pdfIn PDF document text
    • http://jazonewu.pbworks.com/f/tebawodop.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5500 bytes
SHA-256: e6a5dcfa58f1aeac3b48502e73bbae8ce7cd76b283999589222bcd4565f6f4c2
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 11796 bytes
SHA-256: b5112642a5e821e1c669cc11380b93e148c7f2ea6d8eaee448c6a853db7f61de
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16176 bytes
SHA-256: 2f22a9f04fb8f1ad5e7e1c67d3ef5331834762dd4f34dbd438692f8ae23e7869

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