Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cb1d58a0176e3f…

MALICIOUS

PDF

61.5 KB Created: 2020-11-10 08:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4dabbdfbe44a62ac3ff6d12995850aaa SHA-1: e59b776dd0d2188b09b96fe1b2d6b6bd1e45c020 SHA-256: 44cb1d58a0176e3f4ce16763b3529ab666cef02ec01126ad9dcbbbaa0c848378
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'traffset.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffset.ru/aws?keyword=90+degree+screwdrivers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f8c9df1a079f.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/mukut/python_language_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e1383e-01a3-4fe3-b5db-6027b2e929a8/helen_of_troy_curling_iron_brush.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/delonghi_safeheat_heater_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/game_theory_a_critical_introduction.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/wivunonovef/dadezuxubukuxulipufibase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4ca665-b2d1-4f51-85e1-b9c6fad1bd04/79990630628.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/frontier_of_inclusion_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a9b10d-6904-4168-9f21-f95bef9e894a/derivatives_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e297a2-6483-4caa-a842-d359e3fe346c/zumereguserizewidabijebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3862c39b-f3d2-465c-a440-c00d0ed52c31/gadovusuzukefamejipiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/muwusabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc910541-0360-4a07-b95b-d91bab6f78db/gazawijabomosiselob.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/the_package_2018_parents_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
    • https://s3.amazonaws.com/xipavir/deloIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 5220 bytes
SHA-256: aadb6663243089322711f61765598afc946078557378a03ea00d8605b9861902
font_01_sfnt_off0000c660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC660 10208 bytes
SHA-256: 70bde016d68ad7fedee7ea854581f6e1230ce09875e821ada41b67bdae5758e9

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