Malicious PDF — malware analysis report

Static analysis result for SHA-256 81918af2c534af13…

MALICIOUS

PDF

81.0 KB Created: 2021-05-03 21:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8a8e6775b4436643b6badebb0876b4eb SHA-1: 014676ffc74eed99d1285ddab060dbbe02126f5d SHA-256: 81918af2c534af13fbf809f5367e45e7997a67c6713b4a9057f7b45125cca455
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=judith+butler+gender+theory+summary PDF link annotation
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/xelom.pdfIn PDF document text
    • https://kanapajuzusuma.weebly.com/uploads/1/3/4/5/134589940/9603959.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/xixilatedekobe.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/7051234.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/agnus_dei_sheet_music_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugugesazo.myartsonline.com/mewiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/albeniz_asturias_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/condensed_form_of_alkanes.pdfIn PDF document text
    • http://kazaxese.epizy.com/bedtime_stories_for_kids_short.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/the_falling_man_911_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d103991-2fad-40c9-b201-36f0c2ad0da1/how_to_turn_off_a_hot_spring_portable_spa.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/meditation_techniques_free.pdfIn PDF document text
    • http://pumumiz.epizy.com/73345175395.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/geripafon.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_476e2dc6073141b3b59fd04a34ed9182.pdf?index=trueIn PDF document text
    • http://bugixud.epizy.com/xevuweguvudomuwelusagazuv.pdfIn PDF document text
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_4303ba550ac44d098fbb7a60877e3220.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c601c7-b1e2-4d8f-8cdc-bb4f3cf86410/xekofigibexogunudefiwe.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_1f8208af87fa413da9aa118ab1a7a17e.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_9fd0a1526a394be19b39163de52edfc0.pdf?index=trueIn 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_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 5472 bytes
SHA-256: 397493641a8d813f1ffc7bcd92052f2fcf436c1344a33f76dad9d80cb3a353b4
font_01_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 11064 bytes
SHA-256: 4300cef167591a7b6f90515606e73623e48cc5eb215ea350e63347dff3c38357

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