Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dc51dce6d5f273…

MALICIOUS

PDF

71.8 KB Created: 2021-06-05 12:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9f75b7131b64765b62700ef09e55a98c SHA-1: e93b1144b43be991963d78a64a76184a785abb2e SHA-256: 35dc51dce6d5f273c1c89b5ef5974ced80bc03706babee5ed41d827c36d2f016
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a lure for 'minecraft cheats'. The presence of multiple external links, some hosted on disposable domains, suggests an attempt to distribute further payloads or redirect users to phishing sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://huntic.ru/pbw?utm_term=minecraft+hileleri+1.+7.+2020 PDF link annotation
    • https://duzaguzu.weebly.com/uploads/1/3/1/4/131406181/92ffe5.pdfIn PDF document text
    • https://wiriluwakuzukar.weebly.com/uploads/1/3/4/3/134316185/5708067.pdfIn PDF document text
    • https://joxenunufob.weebly.com/uploads/1/3/1/6/131606789/siwowaj.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/ea5c44508b616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144604776/summertime_saga_0.17.5_mod_apk_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fabe765e-db89-442c-b074-9596fad8c287/devoir_interactions_fondamentales_1ere_s.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144439488/tolagazanofutazosob.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144570384/kepasivoduxejijaneke.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/the_sign_of_the_chrysanthemum_chapter_4_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9060ce92-3b97-49b0-b4e3-161aeee7b787/61134784189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92615be3-34e3-4d39-821f-e564d28d4298/zipitufizarevabosovofaxi.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/66861943285.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144486363/lamofapoxixeduluguse.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/manual_canon_rebel_t3i_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc34bbb-be4a-41c9-85c5-4e94defad8cc/mabimixilefulesowigol.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144640038/tell_me_about_yourself_interview_question_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c2f4c2-d110-40ae-ae58-10101d035529/60100050330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c04f55e-84f8-43e1-b3a1-415f15e413ab/craftsman_10_inch_direct_drive_band_saw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445d66e0-b72e-4b59-a71a-c6b0c9ba2786/fulexuwetepitosufipeded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9825cd-437c-4412-acd9-2aa52bf635b3/47495676951.pdfIn PDF document text
    • http://rubepikonot.pbworks.com/f/nabig.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_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 5232 bytes
SHA-256: 29b49bfad3bbd967d88f2d08c5d1f6f817c4248575361882748d7309cc5c1c84
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10520 bytes
SHA-256: 1d23a1f8a25e89981769a211bd69421526ba74488fdc110f5b81a785fe0b0edd