Malicious PDF — malware analysis report

Static analysis result for SHA-256 5040857774506346…

MALICIOUS

PDF

86.2 KB Created: 2021-04-29 20:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b924f1f7003121fc75e0730162beb485 SHA-1: 783b148c90983d88735aaee75d44ae4eb4f26b5d SHA-256: 5040857774506346a1cb5bf357ccf58115330212b84cc74a26ee04ca6d9e45a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to domains known for hosting malicious content or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=wings+of+fire+2+graphic+novel
    • https://cdn.sqhk.co/livukigelo/ghhiHR0/5000_year_leap_study_guide.pdf
    • https://cdn.sqhk.co/wizokawoxo/jiTXzZ4/download_photo_editor_apk_for_android_2._3.pdf
    • https://cdn.sqhk.co/potiribuwuf/eN4ibn2/iron_it_out_idiom.pdf
    • http://gasomenuza.iblogger.org/hd_bollywood_movies_sites_2019.pdf
    • https://cdn.sqhk.co/deloreba/ajaGkja/microban_24_sanitizing_spray_near_me.pdf
    • https://cdn.sqhk.co/xiwasazafu/c6jeC94/will_caffeine_raise_your_heart_rate.pdf
    • http://sotasiwelo.22web.org/why_is_flowers_for_algernon_banned.pdf
    • http://rilotelexewobos.iblogger.org/17962225394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca3b3702-d949-4721-a978-4c29cf23b75f/what_does_it_mean_when_my_lg_dryer_says_check_filter.pdf
    • https://uploads.strikinglycdn.com/files/ab813798-ecb1-4941-b1f1-9011c9a9d6ac/turn_on_wifi_dell_latitude_5480.pdf
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_ce25362699d34fa785de7fdf51ab1637.pdf?index=true
    • http://demunoj.epizy.com/cbse_class_12_2014_date_sheet.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_123e8471547e4d538f77b8a1285ab41a.pdf?index=true
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_766d43c6081e40958549628925be696e.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_96b54435ea1548028f14341c7b0b4f70.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_54f208fd0f2c4833bfe10633ee2ad1fc.pdf?index=true
    • http://kexofiz.epizy.com/beneficios_de_la_lactancia_materna_en_la_mama.pdf
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_0352ea6e0acc451daeca9b5549caef7e.pdf?index=true
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_587b1e0f07874898b1e5168c1bebf755.pdf?index=true
    • http://suwetiwojiza.rf.gd/gilavip.pdf
    • https://uploads.strikinglycdn.com/files/8125f225-f5a9-4c56-8d00-83c70643891c/romeo_and_juliet_act_2_scene_5_questions_and_answers.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_a3b0efc7956f4835912ba14f0466bad0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db5fded1-a30e-43e1-bbe6-79a8b99995be/hp_laserjet_p1102_ink_cartridge.pdf
    • http://xojorefalez.rf.gd/32724341974.pdf
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_f27c1b360a9f4db99f10fda26546d965.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_off0001140f.bin
dab83432c9c6dfa66b6c31fa4795e4c1bcfc0d044e2e04a1e6b9f153b283c286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 5480 bytes
font_01_sfnt_off000126cc.bin
032bca6c40fd8969f3e96d454e042597726ee0aac9430576ec50fab2b254de0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10732 bytes

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