Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e7654cc2a91241…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 02:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0dfd525e5b2b2d8853c90c0e6abd3e98 SHA-1: 42ff670e95ae73f9895a755e2f2da97fbad015bb SHA-256: a0e7654cc2a91241fa11230485c0e968c6fb6bb906c7548d4a9c0a8534b3a191
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to benign-looking PDFs, but one key URL points to zajinet.ru, which is flagged as unknown. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to contain search-related terms, suggesting a lure to a malicious website.

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 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://zajinet.ru/aws?utm_term=whirlpool+top+load+washer+filter+location PDF link annotation
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/671f002c8fd7.pdfIn PDF document text
    • https://lutatodu.weebly.com/uploads/1/3/4/6/134697406/geravozuturef-vuxasuxalupa-fidonaguzeba.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/jezizagoduzaton_fukasogiwebelu_moxulil_tovexufavo.pdfIn PDF document text
    • https://wavupuzubeje.weebly.com/uploads/1/3/4/2/134235525/xugikidugetutus_tesuxonomujiw_rasenupu_tisubexokof.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/gutosidotobopa.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/nujejidawulon.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/4236e4.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/41437828668.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/masijin.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/tisaw-finegijifoni.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/chapter_tension_pole_shower_caddy_assembly_instructions.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/jimivixukaguwipamelemo.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/what_is_the_best_obd2_scanner_to_buy.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/kudefem/evaluating_functions_worksheet_algebra_2_conway_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/37955626287.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/cyberpunk_red_character_sheet_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/zuxefo.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/close_up_pics_2_answers_level_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/bhagwa_rang_full_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/curriculum_map_template_math.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/guidelines_for_hypertension_treatment_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/batojow.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/dell_inspiron_n5010_bluetooth_drivers_for_windows_7_64_bit_download.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5348 bytes
SHA-256: d4770e4899b2bfb90b7b8c9c95a65fbeac63a6bec23169bcab36335a6b11a237
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10232 bytes
SHA-256: 2ff3f566e7667d7ea7c8fd9386114398e311060e398fae887ec1a743c95fb9c1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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