Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ce6d468b26dc63…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 20:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0676d9f03a76c9f9e0f09ccc9d7e497b SHA-1: cef2433057ee0e1efc2505e4f48b2f7661d62edb SHA-256: 63ce6d468b26dc635fc17fa1b07372fb476a5e282f5441d94dec797080819e87
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains or redirect to potentially malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'dafemum.ru' as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to study materials, suggesting a lure to disguise the malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=bank+po+exam+study+material+pdf In PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/4524562.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/audio_bible_tagalog_free.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/loruwozikekikuf.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/5039356.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/tufiwitiguxok.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/LIhcye3/branson_shows_thanksgiving_week_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/GEgfhhq/car_crash_2_total_destruction_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/jbhfehg/11935143680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_1fb151b7376540e6b3ad156990f690de.pdf?index=trueIn PDF document text
    • http://pebuvow.rf.gd/atlas_618_lathe_specifications.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_d595d4171cdc4713b906addcbd06a3fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/how_to_count_1_to_100_in_german.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_22ef30acd42c4e99b34044048b6c2874.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_37eb164fbfe345228da0a8aa91dbb6ca.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_e2f8a8bda28e438da1fb24280e4703f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/master_thesis_template_ku_leuven.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/winogufekifowikeg.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_ce5ed3c3ed514f3abfc81f89d89a73ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/glencoe_geometry_3-_1_skills_practice_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/muxubarimuwibasobedib.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_237d1dad41694b0eb16b2967004ede98.pdf?index=trueIn PDF document text
    • http://desibevazivoxan.rf.gd/31951194137.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_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 5468 bytes
SHA-256: 280803b9ab7c478a6e273bcf6df6c02b3af25d153d471eaeac1d443396fd6bf0
font_01_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 11060 bytes
SHA-256: 1a35b06858f1e5aa1bbfabe2927a109e2246aec1ca15a751d67df80284dcad91

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