Malicious PDF — malware analysis report

Static analysis result for SHA-256 b876fd2cbecf05da…

MALICIOUS

PDF

67.7 KB Created: 2021-03-17 06:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 94638c634ae9b9fbc642b3690b9bc5e6 SHA-1: 966430aefb16db2976d59909935d5dd65f9fca73 SHA-256: b876fd2cbecf05da49d5a4de39214c35168f0befa990a403441823adc2dcfd84
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 0.9996

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://soxebez.ru/award?keyword=height+work+permit+form+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5fed33e38c9ca.pdfIn PDF document text
    • http://vittorguxx.site/what_is_comma_number_format_in_excelxt8v7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444648/normal_604ef995268a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a105c53c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_601571c96ca63.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/6057062581mz13g.pdfIn PDF document text
    • http://axecheat1.xyz/830148363413gpct.pdfIn PDF document text
    • http://expressday.online/vemenilicl6vg.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/c44790de-fab4-4ff4-8f6f-c9672489f3fe/vibufidixojuvavewudozexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9129c80e-b40b-4773-9935-374464bd59f0/vubakapix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec5b3a8-e985-44ba-8e92-038b0a44082e/taputufezujaxafuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504c3920-24b9-4b5f-9725-0419ff2ca4ed/best_wing_chun_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234ac53b-bcf2-4f2a-8a22-ef99dc21a679/panumazaloso.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/warlock_guide_wotlk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5125d7e5-733c-4336-9146-8e52555babd9/exercise_on_helping_verbs_for_class_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77658b2-f287-4e13-b554-4fcda6a6b247/81513585537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a007d43-5246-4526-96d4-88edcef9e07a/peter_drucker_management_is_doing_things_right.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3e5c65-e5ff-4d71-aa21-392f7ed3a599/vekaxaborotejapamoxifonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a478109-f123-47a2-94ed-a2f35aff078b/how_to_start_a_merit_badge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e79dec-d463-46ba-812a-02a29a3bcc58/jajedifinerebixebakexa.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/jarejujox.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/free_anime_keroro_sub_indo.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 5152 bytes
SHA-256: 46696ea4996d66436622fa91b82be6607dbac9c6280bec5f1109d4ac4fc74bb1
font_01_sfnt_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 10172 bytes
SHA-256: 1e690af43079ae6333179a58b0acbe055796667aed885312649eacda239eab9b

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