Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a55a1544abf301a…

MALICIOUS

PDF

80.3 KB Created: 2021-04-03 13:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: db2842b46f9a56362705dcfe8105ab6f SHA-1: ef2472c680929aee64e34b3d5a27d16eaf37ddf4 SHA-256: 5a55a1544abf301a6fe63b706875fea2f724e04f9c6629b238907c39070211d6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to 'xajibur.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the document structure and embedded links point towards a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=what+is+project+scope+management+process PDF link annotation
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/figofezedexefekalin.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/8301909.pdfIn PDF document text
    • https://pazibeze.weebly.com/uploads/1/3/1/6/131636707/4042850.pdfIn PDF document text
    • https://nuvoligugepujo.weebly.com/uploads/1/3/6/0/136092189/292773.pdfIn PDF document text
    • https://bevifosadorafot.weebly.com/uploads/1/3/1/8/131856546/ed2efe9dc62ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d045dd73-3f0b-4e43-9477-72318ba10e8e/24669036186.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/goldman_s_cecil_medicine_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/what_are_examples_of_tone_of_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/buzijegulefemiloribefaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/burewipuxajagawelurojube.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/duxibazelotosipi.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/photosynthesis_and_cellular_respiration_test_review_key.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/72783477655.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/bohunt_sixth_form_twitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1912514d-fb7e-4df3-b108-2304d6902926/dhl_global_mail_tracking_number_format.pdfIn PDF document text
    • http://majuditatip.rf.gd/online_computer_hardware_store_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/rational_fasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77e4ec9-206b-4094-ab78-7b2d401af6d7/fadasukusidutipumewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93168644-7b3a-4c0e-b86a-0f417642efdf/omb_circular_a-11_part_7.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/comparing_fractions_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/lux_guide_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/60967281884.pdfIn PDF document text
    • http://jefurirowa.epizy.com/435815282.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_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 5404 bytes
SHA-256: 4c3769dcc3de21893411978ba314dbea02598107d8c6d2a9a83acef962430886
font_01_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 10748 bytes
SHA-256: 49f3babd6f8dad8a7c39ac4955c7a35eacf9be0e186034ff59240bea8acd7c76

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