Malicious PDF — malware analysis report

Static analysis result for SHA-256 406441bf9c2fac86…

MALICIOUS

PDF

123.7 KB Created: 2021-02-23 19:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c9c3ea75246a0c45425125113dd246a8 SHA-1: 5b0af802ba35b479fc97b95777dcf4e102f024c6 SHA-256: 406441bf9c2fac869e2fe8f4279b7bdcd2c22d0614093ea93edc52865d12688a
156 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 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=transition+words+to+start+your+second+body+paragraph PDF link annotation
    • http://microbestdigitalmeter.xyz/a_r_d_ka_full_formcu64n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_601efd88ed629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408598/normal_6005848ea0bfb.pdfIn PDF document text
    • http://myluckywin.site/mujanivekorutazoa8vls.pdfIn PDF document text
    • http://kefets.xyz/todutct0y4.pdfIn PDF document text
    • https://nugubigu.weebly.com/uploads/1/3/5/3/135323865/fanik.pdfIn PDF document text
    • http://godulonu.22web.org/capsize_frenship_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_602d298e2ec73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_5febc2ca10566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482012/normal_5fef5ec5ebfe2.pdfIn PDF document text
    • https://jibozugapizame.weebly.com/uploads/1/3/0/7/130775201/6312243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumilamufitilu.epizy.com/khadya_suraksha_form_9.pdfIn PDF document text
    • http://vegiroromofi.rf.gd/android_app_splash_screen_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/311408082.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/audiomack_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/kittens_game_guide_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/extra_french_episode_5_worksheet_answers.pdfIn PDF document text
    • http://tejogasev.rf.gd/4401971687.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/angular_7_interview_questions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001907a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1907A 5584 bytes
SHA-256: fa035f489cf3dc310b41ca664578da2d96888fef30c8f130ec29044cd6b77dc2
font_01_sfnt_off0001a37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A37E 11660 bytes
SHA-256: fa66d540da8b071c92629f1907154530d16e6b1861572580bb4dda6395e5d317
font_02_sfnt_off0001cb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB1E 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06

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