Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbd1687fdbf01e…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 08:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b709bb52162f41902dcfef07a3935338 SHA-1: 123088f43e02b0753459e54f56c2b2c9a44de7d0 SHA-256: 91bbd1687fdbf01edbf5b7c6d761a19a84b5c5533fb30b9380630012399ec38a
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://botokaw.ru/wix?keyword=xml+publisher+reports+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387582/normal_606293ad0148d.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/Vhdhgjf/microsoft_activex_control_pad_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5fe921103a9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_603875eb3f263.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/what_does_the_boy_face_emoji_mean.pdfIn PDF document text
    • http://aires.fun/duvovujvoruo.pdfIn PDF document text
    • http://tomandbxof.site/dell_optiplex_3010_tower_i5-3470jatiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5ff2f5709cdb8.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/ljggdhe/latusamedigiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_60535c1858322.pdfIn PDF document text
    • http://marketop.club/odia_dhoka_video_song21knk.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/bUfcyhc/buwidawerozujegijixuzemid.pdfIn PDF document text
    • http://kihepc.xyz/29952973745mvzrd.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/sJWgi83/xitibaguf.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ijsFgcR/imdb_bollywood_movies_list_2019.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/375144256346ezhl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/english_grammar_for_aso_exam.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/76944437854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3a9e4c-9b20-4f33-9371-9c64f9c2bc4f/natutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc0f7ad2-5abd-4912-9cac-3f93801f4281/levepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4121dd48-72f3-455b-8f79-fa4c17c354f2/31203697228.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5596 bytes
SHA-256: 95bb9ba73b6427e263e13487bfeb4a5c2e4de1045930efab2a86ddc8d6d6ae4d
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 10616 bytes
SHA-256: 1f57eec2fed9ead2bc533c7a946a78a11e71c180492a63272dd19dc0ca92191f

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