Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b01d2a4f3486f3…

MALICIOUS

PDF

74.3 KB Created: 2021-03-17 03:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d67c3bd057014b9a7f62cb1452ba0b SHA-1: 2a5bcc62083e9de4a5430bed5fede55519406f23 SHA-256: 21b01d2a4f3486f3de9464341d9296cec66026aaf0b0e02acd330d09a875e498
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Mark-of-the-Web Bypass

This PDF document is identified as malicious by multiple heuristics and an ML classifier, strongly suggesting it's a phishing or trojan delivery mechanism. The presence of numerous external links, including one pointing to 'resalured.ru', indicates an attempt to redirect users to malicious content or downloads. The explicit instruction to disable security software is a critical indicator of malicious intent, aiming to bypass defenses for subsequent payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=zoek+by+smeenk+download
    • https://turabevov.weebly.com/uploads/1/3/0/9/130968962/vapuxosedonuko-falijunorabiw-xuridewelusez-pososedirafuv.pdf
    • https://cdn.sqhk.co/kagupuvasoja/jhjicif/alarm_clock_in_android_source_code.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/tivota.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/zefuditule_juviwamus.pdf
    • https://cdn.sqhk.co/kinibemazoz/8rUxjau/download_stick_soccer_2_mod_apk_android_1.pdf
    • https://cdn.sqhk.co/xogodapap/5jduHjd/minecraft_among_us_map_pe.pdf
    • https://cdn.sqhk.co/letinumi/wkic5Cj/livapukozadupipeg.pdf
    • https://cdn.sqhk.co/kojetozativ/HphdjcQ/15632950082.pdf
    • http://stickerrus.ru/star_falling_from_the_sky_korea_movie4rt9y.pdf
    • https://cdn.sqhk.co/fikalibumi/cojhhic/kobunexubasibesuni.pdf
    • https://cdn.sqhk.co/belesobikezi/hax65gj/delegation_of_financial_power_rules_2006.pdf
    • https://cdn.sqhk.co/vixuwegijelo/hjexvgg/raxitijezusufojutunida.pdf
    • http://rozel.ru/rbse_solutions_for_class_12_physics_chapter_15tnw0s.pdf
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/pegududabip.pdf
    • https://cdn.sqhk.co/soxoxefumuv/fViaGie/43330739085.pdf
    • https://fisokupavunimi.weebly.com/uploads/1/3/4/4/134469682/acfa696ba837ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_68124f5fb0cc49b5b22f3772f9e316f6.pdf?index=true
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_7f715c3c30124132871a883f9b159a6f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a6.bin
887681ff5f0ecf44cec4241c2e25ca88503c316b6fff51c4fcf96b1e30bc88d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 5228 bytes
font_01_sfnt_off0000f678.bin
79407de3d3e389175c3e5602aa02aeea13a21a92ef9114c5f2687808b9043567		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 12000 bytes

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