Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f5436490e1ab63…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 08:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81327abfa742dd5e354907d4700ac6b0 SHA-1: 700945ea17084b9f0fd19aedbebeb19ca488a45d SHA-256: 40f5436490e1ab636f6dbe9bf7031b21d1fe64118969d3de4ddc8f54b74e9e44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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 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://resalured.ru/wix?keyword=iousa+worksheet+answers PDF link annotation
    • https://zowuxebikazusi.weebly.com/uploads/1/3/4/6/134654267/xotogakin.pdfIn PDF document text
    • http://batmbatm.ru/how_to_become_a_service_operations_managerkdr8c.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/famazovikimiw.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/56349475183.pdfIn PDF document text
    • http://good-production9.site/prefixes_and_suffixes_activitieszr3rv.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/bhaXZhh/danuzixuzizurilovuloson.pdfIn PDF document text
    • http://microdigitalmeter.xyz/296044848101emfw.pdfIn PDF document text
    • http://stavki.link/powojedwfpi.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/pefilazejobo_wuluwobab.pdfIn PDF document text
    • https://nazolaruwesibag.weebly.com/uploads/1/3/1/4/131453197/rededatewu_zaxofuj.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/2NkL6Cz/gunship_strike_game_hack_apk_download.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/emotion_wheel_printable_free.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/ibps_guide_2020_banking_awareness.pdfIn PDF document text
    • https://saxenivimagi.weebly.com/uploads/1/3/0/8/130813604/penedewugativ_doxilojokibuf.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/supufebogas_vubaxofotef_rivifebed_wuxamojuguseki.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/hjgiiJM/91656528112.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
    • https://s3.amazonaws.com/veraxawewib/comment_fusionner_des_mac.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/26185471046.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/pisirezaredodezopotivaloz.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/feseg.pdfIn PDF document text
    • http://jibimom.myartsonline.com/12744861442.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/85513223652.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/mabujusimewimazizasi.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_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 4668 bytes
SHA-256: 7866133502146b6356299a56e2916428fb2a2ceaa82bb36153023409b31ad915
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10484 bytes
SHA-256: 67059aee45d079ea2abbeb5b3026cda586f7a4aab6bf424cc4ae82c534af2ebb
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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