Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb7a9a63676a90…

MALICIOUS

PDF

104.1 KB Created: 2021-03-31 02:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 10a05152e35721ae3e7381da2dd31a94 SHA-1: 502fd25c27c680e507a038e93b90dd7beb85bb1a SHA-256: 4dfb7a9a63676a9023efe0fe6f844be157e4688653189785cd66234cf01e2cbc
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating the presence of external URIs and urgency lures. The document body, though partially corrupted, suggests a lure related to an 'ebook calistenia pdf' and mentions 'wkhtmltopdf', indicating it's likely a phishing document designed to trick users into downloading further malicious content. The presence of multiple unknown URLs further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/award?keyword=ebook+calistenia+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368746/normal_6028ed760152c.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/fugl-meyer_assessment.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/bunifaleb.pdfIn PDF document text
    • http://xixevogaxazi.22web.org/weather_report_for_camp_hill_pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_5fd39aff89103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_6016d0867c565.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/malignant_ameloblastoma.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/rezugekolaba/how_do_i_fix_my_whirlpool_duet_f20.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83817082988.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/juxoxuwojez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a489df-64c4-4341-8af1-484b136e0c17/mean_median_mode_range_problems_with_answers.pdfIn PDF document text
    • http://xirozaza.onlinewebshop.net/american_english_phonetic_alphabet.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/164_nj_bus.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/balu_telugu_movie_songs_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/38080776733.pdfIn PDF document text
    • http://wuxekijonudi.epizy.com/bafg_antrag_elternunabhngig_welche_formbltter.pdfIn PDF document text
    • http://xasejumav.onlinewebshop.net/58574520048.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/bajazopesobasukoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7049b88-c863-41c7-bc81-5c5489a605c8/hayward_super_pump_variable_speed_replacement_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f525563f-f215-49f7-bb96-43e07e7d3c80/how_to_clean_whirlpool_he_top_load_washer.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_off00015ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC6 5212 bytes
SHA-256: 4f61f4570c2afc0b980362be6553bb5f2042bc301f98db564578fec9b96e8eef
font_01_sfnt_off00016c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9A 11276 bytes
SHA-256: 4328aadb207181515ec2b1eb23506bf74930bd0171780e9ed9ec5c408f69665a

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