Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cc57c353e15e13…

MALICIOUS

PDF

92.5 KB Created: 2021-03-30 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 46f97bb02e8ac9e10506b8aaf495fc4f SHA-1: 3b79b09f2d06c97fd39ee9bab48f25bfd0f55223 SHA-256: 44cc57c353e15e13e9c42d7f5db1e02fc996cae16f904e7b58060fc853d883ba
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for a worksheet, likely to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/wix?keyword=the+sun%2527s+interior+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374196/normal_6005a2cd30d57.pdfIn PDF document text
    • http://begemotiks.space/samsung_j727a_root_file_download_sitv40z3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_60143bee29686.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/jshi0cH/fireman_ed_quits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5ff06f549abc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_602f51260fe29.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/reflexes_sobre_a_arte_alfredo_bosi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/q9ge1W2/call_of_duty_mobile_game_download_play_store.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/binary_options_trading_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rezejigobip/d2jgVjg/gewimoxume.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/8W9fifD/automatic_hook_setter_fishing_pole_holder.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/agjKEgd/19535777677.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/iahgsjb/32556750074.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/igcgWhj/48376604174.pdfIn PDF document text
    • http://parkingtest.xyz/dajugevebozunuf8rd1.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/fhggeZg/fruits_forest_rainbow_apple.pdfIn PDF document text
    • http://putijeku.22web.org/nlt_bible_free_download.pdfIn PDF document text
    • http://helplnstagram-confirm.com/he_is_the_great_i_am_the_everlasting_father_lyricsj4fun.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
    • http://romakilax.myartsonline.com/voxedumoweboj.pdfIn PDF document text
    • http://fufapawaxuta.rf.gd/ruzuvedamul.pdfIn PDF document text
    • http://zixedofa.epizy.com/5455977586.pdfIn PDF document text
    • http://rikulovesemura.rf.gd/sotuvoxowofigigo.pdfIn PDF document text
    • http://moxuzaridob.onlinewebshop.net/10498041668.pdfIn PDF document text
    • http://venugowus.epizy.com/wofiraded.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_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 4764 bytes
SHA-256: e49049605d0f5ae6f0e6f159515e2c4f525b196896e3968a18e2fcaa03299498
font_01_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 11188 bytes
SHA-256: e18b8de0389ea46419bf12203b20dd06febe5e5bf540108659e9205a9e300019
font_02_sfnt_off0001561d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3