Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad2749f0d6298b9…

MALICIOUS

PDF

86.7 KB Created: 2021-04-01 12:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a178e6f614304fd1d3a90e7d33b0ede8 SHA-1: db66393a9a88adb35446952f16c05818617b5760 SHA-256: 8ad2749f0d6298b9d9ef511dd241a9b4cd7f246b400f6266df7fdbfa5d643d7e
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=how+to+write+poems+in+english+for+beginners PDF link annotation
    • https://cdn.sqhk.co/mutexeze/gKWbrjg/bulezujakaluruseweguf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369784/normal_5fca800d5525d.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/8TzNgdA/glimepiride_and_metformin_hydrochloride_tablets_usp_monograph.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/eA2hcgh/zombieland_road_trip_gameplay_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/f8Igdhb/sawegefamijanibufiwuwiwi.pdfIn PDF document text
    • https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/pejijekagamurit-miwukuzatu-pexozararo-wosebu.pdfIn PDF document text
    • http://xudikuruno.iblogger.org/dr_zhivago_novel_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/fatobaliv/fuicz53/free_word_search_games_offline_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/dibidhf/62638780817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_602d40d334e5e.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/94b7c03bfde6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_605aa668b4697.pdfIn PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/823fda2f6184.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/Siil4q1/bivexip.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ihsgfgh/29026330188.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/1C3Qja2/goat_simulator_multiplayer_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_5fe80c3a18538.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://juxudawalugevop.epizy.com/kalibi.pdfIn PDF document text
    • http://morisexisaxewa.epizy.com/camera_preview_android_rotation.pdfIn PDF document text
    • http://batubegirego.rf.gd/32967305496.pdfIn PDF document text
    • http://zorogimejovag.rf.gd/telerik_radgrid_commanditemtemplate_code_behind.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 5088 bytes
SHA-256: 3648905a64779710bea6fc4c4967d1b72725a86864c4c395e8b561e371ecef05
font_01_sfnt_off000118d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 11184 bytes
SHA-256: ee56e9092712cccfaeec784fa97d36a447da98f30a6b2f6ee90537edea98739b
font_02_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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