Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c8895037ab80df…

MALICIOUS

PDF

76.2 KB Created: 2021-03-28 00:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aadd19200c8d350e95cbeaa7d8650fcb SHA-1: 1cb55a2afb239e567e96f90fd0a2f307aabc63c7 SHA-256: d9c8895037ab80dfa71da85ecb8dfe5e751d608fbc068437a86756e85e0a868e
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+thread+a+singer+simple+2263+sewing+machine PDF link annotation
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/zunon.pdfIn PDF document text
    • http://mebelintera.ru/calculating_speed_time_distance_worksheet_answer_keyowlaz.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/3227258.pdfIn PDF document text
    • http://hugertely.xyz/57355391987mixp1.pdfIn PDF document text
    • http://reassurez-moi-fr.info/78046815262zq01h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_6046215094039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_603febf761b34.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/suweva.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/5f39cf5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_603d37178e698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6027dfd42f317.pdfIn PDF document text
    • https://ripabukufekova.weebly.com/uploads/1/3/0/7/130738984/bumebuwakedemep.pdfIn PDF document text
    • http://reretola.iblogger.org/52241661358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_60549dab0833b.pdfIn PDF document text
    • http://getfreecreditreport.info/t_mobile_zte_hotspot_mf64cjx86.pdfIn PDF document text
    • http://se-mrush.com/51409433557nzcrz.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/xabalaru/inflected_endings_worksheets_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/vlookup_in_google_sheets_from_another_tab.pdfIn PDF document text
    • http://rapabilalame.rf.gd/bollywood_hd_songs_free_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/enhancement_shaman_wotlk_pvp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/que_es_el_sistema_inmunolgico_y_como_funciona.pdfIn PDF document text
    • http://lodabaximuxulul.epizy.com/marriage_resume_format_for_girl_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/buy_sony_a6500_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/how_to_write_a_personal_background_statement.pdfIn PDF document text
    • http://sejofepoga.epizy.com/cnet_s_avast.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/15236931311.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5992 bytes
SHA-256: 87eb6bd0ca3a149f51c656b3a01f6c6196a8a3c030dac85979f8f6d525cfd089
font_01_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 11504 bytes
SHA-256: 4981e14c181dbb52ca8e3bfff5ffae7fe0b219861adbf9226232536ed251d2a0

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