Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d23509b9ca8c5f…

MALICIOUS

PDF

92.8 KB Created: 2021-04-17 08:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: df353020ee62a4dc2adef2a21090de80 SHA-1: 89e90aaa04334c092d14c095316d0a46ba6fb9aa SHA-256: 52d23509b9ca8c5fe5d2f860d748cb490b278a1a91e59cf8fa0e7d5dee73187b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=ethnography+phenomenology+and+grounded+theory+approaches+to+qualitative+research+methods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368748/normal_60518578711b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_606e9175df085.pdfIn PDF document text
    • http://vukabuv.22web.org/heterogeneous_and_homogeneous_mixtures_quiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ff768827e721.pdfIn PDF document text
    • https://cdn.sqhk.co/fekebazi/dgcpY18/47528958112.pdfIn PDF document text
    • http://nusoxex.iblogger.org/wamezitojujekefaxijizo.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/h4hfgjJ/55003354064.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/wulotugadag/code_compare_for_windows_10.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/heads_up_concussion_fact_sheet_for_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50167bb7-77bb-4cfb-b43d-beed3d53dedd/how_do_you_adjust_a_refrigerator_thermostat.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_7b725aafdccb4ee4a18001759de5ee0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/nixepakatejefakuguwuta.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_8be372d6c28b45499f1149b6cbf04c57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/hp_laserjet_pro_400_m401a_driver_for_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df7a789-8834-49ad-a225-21fd3ce3a04d/best_tai_chi_for_beginners_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5770afe8-cdb4-4690-affa-73a3b9520cfa/easiest_hindi_songs_to_play_on_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/barasti_hai_meri_aankhe_whatsapp_status.pdfIn PDF document text
    • http://wewepov.rf.gd/appointment_booking_application_android.pdfIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_79200ee42db64c8189643f94ec58a4f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safago/65787153813.pdfIn PDF document text
    • http://kigexozuzexozo.rf.gd/nexigal.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_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 5732 bytes
SHA-256: dbd6acd1670dfec87d02a57a18a58096722f47d36fbb709c9e6366e6a561598a
font_01_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 12068 bytes
SHA-256: aa07389a0887dce6670cfd81ae4b5b2ea03a52112c9aefca797854eb3fa547b1

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