Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7627a22eddd1338…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 04:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77a1782896a091f80acb82b35a959bda SHA-1: 88e187966987fba70ee20600ddc9158c6b094853 SHA-256: c7627a22eddd1338742a2ad6a6540bd39b3eb2dc3819e88630feb37ca416e03d
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 0.9997

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://leonvi.ru/123?utm_term=solving+exponential+equations+and+inequalities+answer+key PDF link annotation
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/9987322.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/taredusobutivemuxaru.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/autocad_2020_tutorial_indonesia.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/vosatabufar.pdfIn PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/28df2.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/2c335edbe9e5.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/62702460808.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/suxugipipolazog/betuwipapar.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/52341272987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626e5726-e58f-4293-992c-712a0243c247/vipategibovepo.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/art_of_seduction_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5971b05e-1bae-4ed0-b29a-f7309ae00613/semor.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/roku_3900x_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/autodesk_vex_robotics_curriculum.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/23865638457.pdfIn PDF document text
    • http://natizuf.onlinewebshop.net/3762767752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de63cbcb-bb8b-4dd0-9bad-fad72ddf34bd/79593269647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdfb09d-952a-441f-aaaa-5a7cd1870cb1/68353847706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b495f7af-628f-42a4-b610-1080839fb2d6/43812839517.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/pabefazo.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/assumptions_in_qualitative_research.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5740 bytes
SHA-256: 647aba7f60dec398f609d1b7fab043e9ee753d64ed5548366c4f407e45714343
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10944 bytes
SHA-256: 93bcd82a8445e40fbe7266af4865908e9aaa7036f649b28b14b400b4d0204b1b

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