Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c4f346609d4654…

MALICIOUS

PDF

76.8 KB Created: 2021-03-19 22:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 188371366eccdf44ea7b22e2f4aaa71b SHA-1: 5ea698471982adb6b6976cb08e82ebaf177d1645 SHA-256: 33c4f346609d46548a4bffcb11c5c8aa997a90e51f13aab26855c7bb61af01c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'translating algebraic expressions', directing users to a suspicious URL. The presence of numerous external links indicates a likely attempt to drive traffic to potentially malicious sites.

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/123?utm_term=translating+algebraic+expressions+pdf+with+answers PDF link annotation
    • https://cdn.sqhk.co/defisepeniba/SCjcMRr/smash_ally_zack.pdfIn PDF document text
    • http://jologedeb.getenjoyment.net/bissell_proheat_2x_revolution_pet_pro_owners_manual.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/9303723264.pdfIn PDF document text
    • http://femuloririv.iblogger.org/64228853343.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/eEWiaie/dofodusuvutovarisepe.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/47752242532.pdfIn PDF document text
    • http://jixuvofariva.iblogger.org/south_park_the_stick_of_truth.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/sIjaibw/multicraft_block_craft_mini_world_3d_descargar.pdfIn PDF document text
    • https://cdn.sqhk.co/razanifuwuz/iegjhhS/legekanatebubego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifiz/australian_animals_koala_information.pdfIn PDF document text
    • http://magekuj.rf.gd/chaitanya_charitamrita_book_in_bengali.pdfIn PDF document text
    • http://munuvuzuwewojef.epizy.com/how_do_i_change_the_input_on_my_toshiba_tv_without_a_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/chapter_5_math_test_6th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/test_internet_speed_apk.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_40f698769447460691b3108d1dff470f.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/business_strategy_analysis.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/what_is_roku_streaming_stick_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/2359911890.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/guredafaxikaful.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/mp_rojgar_aur_nirman_download.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_30cdaf726e714edaa000539087a6e183.pdf?index=trueIn 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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5664 bytes
SHA-256: 47504bdf9fcf83144bb0b3576b3ed38238229169899af960ea79ecb9d819739e
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 11012 bytes
SHA-256: 394576c63a852025642f75dbcb7d5c2a01e14315ad4c9bd0ea46e33a1acdf13c

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