Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ea4f498fc581b…

MALICIOUS

PDF

75.4 KB Created: 2021-04-07 01:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c36be4d64ff48817ef7827fe9c6baffa SHA-1: 72d3006a3e3824c8d0cb39555d534e15c9cf9470 SHA-256: 852ea4f498fc581b7c8bad043e51596387571580eaccb3a37489e328bcb50df8
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=clash+of+clans+hack+easy+no+human+verification PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464527/normal_60034a0fa8093.pdfIn PDF document text
    • http://juilopkiretlo.ru/2190779071223i0q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489264/normal_5fdf365c5682b.pdfIn PDF document text
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/jigezisanilo-suparozotafetu.pdfIn PDF document text
    • https://negipefit.weebly.com/uploads/1/3/6/0/136054485/4fba042.pdfIn PDF document text
    • http://mydenverneighborhoods.com/what_is_descriptive_text_in_a_storylnz3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426687/normal_5ff96c3d2edd6.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/keverarepubigidu.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/beginner_s_guide_to_meditation.pdfIn PDF document text
    • https://banatili.weebly.com/uploads/1/3/5/3/135314160/9982777.pdfIn PDF document text
    • https://mizevazorabij.weebly.com/uploads/1/3/5/3/135347525/vodusotamesu_gerowina.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/b537b86.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/gagedu_xemigazuzigodo_kupawalaxilupum_lufokigeroder.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/husky_120v_inflator_review.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/piradi/clothes_horse_for_drying_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/20649364955.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/arduino_leonardo_pinout.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/big_ideas_math_book_8th_grade_answers.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_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 5252 bytes
SHA-256: ed6dd935dd450edbd30d24854c1c206faa1e5d52c05e4bacf8e9ca76a326260a
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 11360 bytes
SHA-256: 2b74a8c580ec0273475db9b6ba0411c811b26c63b891eada8de9273a5ab784b8