Malicious PDF — malware analysis report

Static analysis result for SHA-256 52200524bc5e339a…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 23:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9b9427fc065f799d9fbaf296f42dc15 SHA-1: 5c1100fd4e54ea2818842d524d431ebb40d297c7 SHA-256: 52200524bc5e339a23eaac25800b0e1760421185fb1da999536657db9d6113dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://resalured.ru/award?keyword=adobe+premiere+pro+cc+2020+pdf+tutorial PDF link annotation
    • http://b0xberry.online/46666009795k1sm.pdfIn PDF document text
    • http://reduslimer.website/181601434852jh4u.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/xederinoradtj67n.pdfIn PDF document text
    • http://fruitik.space/28357992596brhwd.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/58895.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/vigepulexivexapevom.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/bihoUgj/mysejahtera_register_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/gJeijxX/chronic_pancreatitis_guidelines_uk.pdfIn PDF document text
    • http://dololebajug.scienceontheweb.net/zidefep.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/8351422.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/semezulitavefatapa.pdfIn PDF document text
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/c7a2a14f0e7d.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/80c6f6ea-5063-46ab-9dcd-c7a56fbc45c6/logobetabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a500dcce-50f1-4843-afb4-6143f8961ece/how_accurate_are_bodyfat_scales_at_gym.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/sojaduw.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/what_are_examples_of_interpersonal_conflict.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c84bec-24a0-49a0-a32c-2e3bdd2e4c14/advocare_24_day_challenge_workout_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/80014507473.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/linear_programming_worksheet_with_solutions.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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5524 bytes
SHA-256: e990230c10fca56fca9a6080dedf212250ea78e7790d07e5bda709c6674f4021
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 11628 bytes
SHA-256: 09b499c2d38c6f6b4ad8144df13fc336c0b38a08e18e05832907e02d5516596b