Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aabc3816fdcd65…

MALICIOUS

PDF

75.0 KB Created: 2021-06-04 16:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75405b0d7203b556e22f212e8039e1cc SHA-1: 18253e9db1f7ad193665df4d71723f80465642b9 SHA-256: a1aabc3816fdcd6512b3df423383d9f05c10f2759b99c531343a3e29d6b0f1a5
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://nomylo.ru/pbw?utm_term=katya+elise+henry+workout+plan PDF link annotation
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/kuripawezoto_mazusev_mojumuronu.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/7956648.pdfIn PDF document text
    • https://lameperitilexi.weebly.com/uploads/1/3/1/1/131164355/3694363.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/sebalaxedixe_meviwuj_nadowalonolil_sisirolaruku.pdfIn PDF document text
    • https://logudapixifoke.weebly.com/uploads/1/3/4/3/134371583/08811f.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/3888272.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/9202888.pdfIn PDF document text
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/nunim.pdfIn PDF document text
    • https://xitenewoz.weebly.com/uploads/1/3/4/3/134314294/somekovi.pdfIn PDF document text
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/7aa8a6d9d15ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144612867/the_land_of_open_graves_introduction_summary.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144513699/47761460962.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413997/can_you_cook_stuffed_chicken_breast_on_the_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7dd185c-32f9-4476-acc7-3e3ecc7efde5/what_is_the_most_powerful_dewalt_leaf_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca05d77-294b-4adb-b85a-d425d4a14991/what_is_after_new_moon.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/f/download_music_tracks_free.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/50138848178.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_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 5132 bytes
SHA-256: 1c44df4d8b1db1fcb46eea9942a3dbf5f93261da5970e0a3ab6ad37a886aa2fd
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10764 bytes
SHA-256: ee17f2415dbdd18c29169976e9c92e2f4455c36536f8806ad47d6d8e666c61dc

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