Malicious PDF — malware analysis report

Static analysis result for SHA-256 68224c36dc46f5a4…

MALICIOUS

PDF

75.9 KB Created: 2021-06-05 15:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d447b433869913582e4c7a46eeabc4e3 SHA-1: 24e05acdb7b377ef914a83ea8be02603459a2012 SHA-256: 68224c36dc46f5a44e86121bf7fa471a23dfbcd0e571a59522189dd49570757f
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links, with one prominent example being 'https://chcial.ru/pbw?utm_term=what+is+the+best+slime+recipe'. This suggests a malicious intent to direct users to potentially harmful content. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing the phishing and trojan classification. The presence of embedded URLs and the ML classifier's high confidence score further support these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://chcial.ru/pbw?utm_term=what+is+the+best+slime+recipe
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/vabusemabi.pdf
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/3873055.pdf
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/lorude.pdf
    • https://baxodibidixajit.weebly.com/uploads/1/3/5/3/135311382/e72f19a905b5d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0cec4563-31c7-47e2-9819-0c448955321e/82941818133.pdf
    • http://mosijiv.pbworks.com/w/file/fetch/144424395/59086096726.pdf
    • https://uploads.strikinglycdn.com/files/46715cd9-645e-4620-859c-69c428f5bba7/what_influences_health_behavior.pdf
    • http://vafobotigef.pbworks.com/w/file/fetch/144636795/minna_no_nihongo_2_choukai_tasuku_25_audio.pdf
    • http://zusemivak.pbworks.com/w/file/fetch/144537756/pijop.pdf
    • http://nafidob.pbworks.com/w/file/fetch/144640719/airline_pilot_uniform_sweater.pdf
    • http://ravowibosu.pbworks.com/f/1456500523.pdf
    • https://uploads.strikinglycdn.com/files/9de22086-cf79-4c70-8e99-28f50e34cba7/58066541765.pdf
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422592/am_pm_ka_full_form_kya_hoga.pdf
    • http://fudejob.pbworks.com/w/file/fetch/144497880/rent_lease_agreement_forms_free.pdf
    • https://uploads.strikinglycdn.com/files/7506977b-0315-4922-b34c-36d397100aaa/how_to_get_good_heroes_in_marvel_contest_of_champions.pdf
    • http://sonubugu.pbworks.com/f/iobit_driver_booster_pro_key_2020.pdf
    • https://uploads.strikinglycdn.com/files/3597cb43-8269-4d9a-9bf0-4facf25704bd/pride_and_prejudice_quotes_mr_darcys_second_proposal.pdf
    • http://gapufipi.pbworks.com/f/renoxoniduwinizofoj.pdf
    • https://uploads.strikinglycdn.com/files/8271caf6-c295-4947-ad0a-917b76254ff3/54284933476.pdf
    • https://uploads.strikinglycdn.com/files/53d37c5b-e3a8-42c1-821d-45830787c1bf/72621389163.pdf
    • https://uploads.strikinglycdn.com/files/dd825d36-4917-4d4f-8344-5c0666676336/10000_most_common_spanish_words.pdf
    • http://negovijalulu.pbworks.com/f/bawinukodopunesewowi.pdf
    • https://uploads.strikinglycdn.com/files/cdb39ebf-30aa-4f07-9553-ed8f008a5e94/44716503044.pdf
    • http://zuwofig.pbworks.com/w/file/fetch/144534969/cubes_and_dice_-_non_verbal_reasoning_questions_and_answers.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144416133/gexanefodolotidise.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0b.bin
3be1c8e5fe42bd2648b465549ab9f7e4d0cdec299af73606cddd114684f1ed82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 5324 bytes
font_01_sfnt_off0000fe03.bin
fe5596a1b5a2d3a00617fa8554b31aaa7ec0339227797fe4b1a1559636c5f129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 10776 bytes

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