Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58673f8d5638539…

MALICIOUS

PDF

81.6 KB Created: 2021-03-27 22:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4801311f202012037717530d40c2213e SHA-1: 22ff31bef9ba31bb88da92114bcf9391c5f36950 SHA-256: b58673f8d5638539a712561b388bd6f5cc5c5d0ac59355c5eb3f5425c63178de
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://midufefew.ru/aws?utm_term=how+to+change+limit+switch+on+furnace PDF link annotation
    • http://fomigiv.mypressonline.com/role_of_explorers_in_colonisation_of_africa.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/33464381086.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/how_to_make_a_website_with_wordpress_-_divi_theme.pdfIn PDF document text
    • https://gikapatom.weebly.com/uploads/1/3/4/0/134042778/vuzopabegili_mifexozan_pepejij.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/beliefs_meaning.pdfIn PDF document text
    • https://gefeteki.weebly.com/uploads/1/3/4/3/134310298/d57141e0feaeec.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/7786506.pdfIn PDF document text
    • https://xupusunozad.weebly.com/uploads/1/3/1/0/131070799/33ef0cf31.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/74228657859.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/4b4e7698-6e0b-41b5-a48f-01cfffb921b0/gakibarig.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_e56d1135e7544b5c8cf34132ea0b5640.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ab5e42-3850-45bd-8b7c-03fbc2db146a/pride_and_prejudice_movie_online_subtitles_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/sizaz.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/dell_optiplex_790_lan_drivers.pdfIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_cc02524a777242a684c52f92f9ef0f04.pdf?index=trueIn PDF document text
    • http://wukevivetarapu.myartsonline.com/koviri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d170c2-43ea-4d4b-b67c-5b856e71a3dc/7615043250.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/appvn_android_english.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_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 5348 bytes
SHA-256: 6f71240d80d603ba833e9e6bcaafc853377ba2ba7defed0a72865aab94140a5d
font_01_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 11100 bytes
SHA-256: 84a33f5de1cf42aaac40c8a12cbf12f8437738eae077e5e971f9d5569c63e960

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