Malicious PDF — malware analysis report

Static analysis result for SHA-256 0837132eaa141ea1…

MALICIOUS

PDF

74.8 KB Created: 2021-04-02 00:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b62dba3f24ea3ea03781c6ae7cbecc7e SHA-1: 876490b94f8224cdf2a2fb8b4168d1d8b2bb4a91 SHA-256: 0837132eaa141ea18fe9c507e54de5252a7ceab28af0b8981a5d7b0395b2a816
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/123?utm_term=javascript+make+button+not+submit+form PDF link annotation
    • http://gta-msk.ru/international_criminal_law_textbookgp7vg.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/kodaxan_wenofapametovi_kegetoduguk.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/fugomadaga_molurobonosu_nolitepuj.pdfIn PDF document text
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/waxiwizawe_kuzisufu_katetegu.pdfIn PDF document text
    • http://iuts.space/87537514032rqf2i.pdfIn PDF document text
    • http://solimabifiper.iblogger.org/what_can_you_cook_on_a_pizza_pizzazz.pdfIn PDF document text
    • https://detudonerud.weebly.com/uploads/1/3/4/6/134660859/xewipetose_kovufivamupa_beledokagofotar.pdfIn PDF document text
    • http://shortsomfj.space/bancomer_movil_apk_versioneskolm2.pdfIn PDF document text
    • http://sodaapp.pro/fagobosasumezuzujumequzmj.pdfIn PDF document text
    • https://wesatelifap.weebly.com/uploads/1/3/1/8/131871597/6b6ef85de5ed6.pdfIn PDF document text
    • http://boevoenlp.com/listen_to_the_book_of_enoch_online_free4zuus.pdfIn PDF document text
    • http://ketadiets.site/lixoruxudegor0ujo.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/twilight_breaking_dawn_part_1_full_movie_in_hindi_youtubewezca.pdfIn PDF document text
    • http://meetplafond.xyz/99688945277h1k5m.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/jenagubadopi/93716005628.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/16857791608.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/chrysanth_cheque_printing_software.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/wwe_mitb_2019_results_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/awdhesh_premi_song_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/accidents_reported_near_me_now.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/cragheart_strategy_guide.pdfIn PDF document text
    • http://pekabufo.epizy.com/procare_humidifier_parts.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/vande_mataram_song_dance_performance.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5384 bytes
SHA-256: 2687934f4ec462e9bcd834882f9eab2c44c9747865616c8123f7c78f1290a4ee
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 11064 bytes
SHA-256: 60ca689a3bd0ca01788d14f9b65f2730f5641b49feb7add31695ef995bfa593d

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