Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0547d53bd23a3eb…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 15:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 10e51b8ed4bbf9fc1d5eae2037d55219 SHA-1: 5835cb1dba7956813775ba96a488fdd3557d3765 SHA-256: a0547d53bd23a3eb7f1012bb1bd3a9afaa831c0ac07c2543d9abf965500a0c8e
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 0.9997

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://kuzutuzo.ru/strik?utm_term=the+tibetan+book+of+the+dead+a+way+of+life+documentary PDF link annotation
    • http://fitokaps.xyz/arthur_c_clarke_books_sinhala_downloadyxwek.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/manazofogovu2hgby.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464302/normal_5feb07bdb0db3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_602294cc692cc.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/nasapurugomawixoperup.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/437730169521z6ze.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/xapadulape.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/qjcEAhf/music_equalizer_software_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • http://evatopshop.xyz/40159843726m2xh3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5fe1cd1820eb3.pdfIn PDF document text
    • http://ostanni.fun/divisibility_chart_worksheet6ud7r.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/69772589369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_603f47df21104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_4ddd2a0e4f3848febbccc671fa1aa65c.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_eef4fcf9b2d1478f8f35fb6fac5f83ac.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_71b9642de1a5494e9bb09c7fb11bb166.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_f60b41f01e27432ab70cf49c18e5fec6.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_b087298706a94ef484dacc98db1ab764.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_64c5ff1f2180462c8b3c6aeaf27fb838.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 5432 bytes
SHA-256: 9b676f05a142120153ab121906b5b9cd3edaa688937e10547d29fde502cc0aa3
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 11648 bytes
SHA-256: 61e98e4914bc76574c6c97bd17da2985426194fab82d6c2b01074e5118b02c96

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