Malicious PDF — malware analysis report

Static analysis result for SHA-256 c884435a52e90e88…

MALICIOUS

PDF

75.4 KB Created: 2021-02-09 12:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 96cfecd29cd078c5aa8ee93ff88844e3 SHA-1: 66a00d403e999710cb828b6fe6ab7c097b5a91d4 SHA-256: c884435a52e90e883175c8e9f13ce80e28ff67f07dca0418520a2fab862c0187
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/aws?utm_term=high+stakes+gwent+tournament+guide PDF link annotation
    • http://exampl1214.com/60224768184wdorh.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/ggxigjb/metal_slug_3_apk_uptodown_gratis.pdfIn PDF document text
    • http://daddytestit.xyz/deal_genie_real_estateovbuy.pdfIn PDF document text
    • http://madamzero.com/guxufatoferonobexe99iv2.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/46798356276.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/pilazi/tte_full_form_indian_railway.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/mepopewinuke.pdfIn PDF document text
    • http://govatojajij.epizy.com/cici_goodbye_video.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/58819105915.pdfIn PDF document text
    • http://xarozitapakegur.epizy.com/the_eight_parts_of_speech_worksheet_answers.pdfIn PDF document text
    • http://nopuzowisaw.rf.gd/1371298993.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/davozotatedi.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/lilalewekezirixapowadim.pdfIn PDF document text
    • http://gigivixegaxun.epizy.com/big_fish_coloring_sheet.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/41308400674.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/22439186284.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/kuzowuweromalidejugamovof.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/cghs_plastic_card_online_form.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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 5324 bytes
SHA-256: 4f53d9863973dda8c0ca4eaff97ada7c96c7de1dcbbdf4af4aeb657f91cb3cab
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 10320 bytes
SHA-256: b6c437a90910647d078460a5a6dd4430d6644dedc585e69965131896eeb22720
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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