Malicious PDF — malware analysis report

Static analysis result for SHA-256 85795eed0af6fe5f…

MALICIOUS

PDF

99.0 KB Created: 2021-03-31 06:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3cad5452642151d0b1e59cd0c3659d3f SHA-1: cc9dccdbab64d97b3b717429f37f750cb1255d94 SHA-256: 85795eed0af6fe5f466568aef5bfcc1ea756058b312b88d017fc0a958680a472
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'mental status assessment speech' and embeds a URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate maliciousness, classifying it as a phishing trojan. The embedded URL is likely used to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=mental+status+assessment+speech PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5ffa58eeed89b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60217054b0796.pdfIn PDF document text
    • http://lodolujin.22web.org/4673297409.pdfIn PDF document text
    • https://cdn.sqhk.co/jolekusij/hhjjVge/desuvevilid.pdfIn PDF document text
    • http://kisedevobale.22web.org/kigamepit.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/hhhDhhV/wefalurutanekezaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojodiguf.rf.gd/tusuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabadbd7-f270-476c-909d-260868e7c0bc/855598187.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/mufuja.pdfIn PDF document text
    • http://difiwawi.epizy.com/arabic_numbers_1-_100_in_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/google_sheets_templates_family_budget.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/android_google_login_12500.pdfIn PDF document text
    • http://susosutudufat.rf.gd/zosyn_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f623a3f6-5ceb-4aa9-8ef1-d55c9ce37b4d/zematunenadadibezamolez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7d0846-5f62-45d3-ab81-d0722f2b3fc1/43432092333.pdfIn PDF document text
    • http://bulufuw.rf.gd/39894111988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de1a07e-7554-47fd-bc75-93230b6b2a2f/16565377689.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/metformina_mecanismo_de_accion.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/poe_blight_tower_guide.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_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 5080 bytes
SHA-256: 1c5847feeadbbcbfee6d61abc5c36cc5daeccf482b5ae80af218408365e2b684
font_01_sfnt_off0001577f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577F 11448 bytes
SHA-256: 16ef595251a7d34ef7a69beca650d6e10ae8048e5c834184a8db37dbdc2993d8

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