Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bd0bfda3e139d1…

MALICIOUS

PDF

103.6 KB Created: 2021-04-19 05:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce94b240ec759c2c476145031f919ae2 SHA-1: d889f543f12859726c50c5555e3933ffb5236630 SHA-256: b5bd0bfda3e139d1b49b10a632134ad6170958d67dde39ccf1297f40bb70ccfd
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://soxebez.ru/strik?utm_term=ender%2527s+shadow+movie+release+date PDF link annotation
    • http://kartaidatodemeleri.com/culture_sur_brulis_avantages_et_inconvnientsyqd1u.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/zumuxikijijiwilew.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/1f94e931b8d.pdfIn PDF document text
    • http://fridgeservice.ru/91102238514ozwxj.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/2a659cfdec.pdfIn PDF document text
    • http://dilomevoje.22web.org/counter_strike_1._6_game_free.pdfIn PDF document text
    • http://xsale.trade/88766950267or6h1.pdfIn PDF document text
    • http://pigexavenume.iblogger.org/who_invented_the_chess_game_first.pdfIn PDF document text
    • http://idealicaitalia-official.site/ziminelilos7pnf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a40e97a-8964-4e32-9eee-85f3885ab59e/dirt_bike_helmets_stores_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b5a4eb-30af-4474-975f-8aa18500cbac/english_grammar_tests_online_elementary.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/metallic_bonding_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/amrita_virk_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/central_and_inscribed_angles_mathbits_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/dejif.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/much_ado_about_nothing_act_1_guided_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/viker.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/66406325643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd199ec-b621-495f-a563-5cd64e97239f/dakopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970a2613-9a3f-468f-98ef-7c4af17a0fd4/how_much_is_samsung_s8_in_slot_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49583e8a-58ab-4af1-935e-e890bb60b2f7/29548767607.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_off00015522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15522 5208 bytes
SHA-256: d6f9de396f94c2950245742607f2501cfff097705971f63bf542f1339ef1f236
font_01_sfnt_off000166cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CD 12272 bytes
SHA-256: d4586b84c57c958571e8b2e474f4c2dc5a9cac7991c735431f230643ea3ed044

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