Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e3329a96553cf1…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 12:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2873dd5b90bea1220164ba08dc89bb3d SHA-1: 35d646b35f8ed3b84ceee64732d5ff03ccd240b3 SHA-256: 64e3329a96553cf179a7ef550bc4ebc4e91b1e42fb8dec19ba828b0a81f166f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://lozipotod.ru/aws?utm_term=how+to+install+comcast+remote+to+tv PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff448562a43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_606d2879a7626.pdfIn PDF document text
    • http://kesosobozu.iblogger.org/free_download_spoken_english_book_tamil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_60494ea50189a.pdfIn PDF document text
    • http://risizotifapeju.iblogger.org/cerebral_palsy_in_infancy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_606698651a8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fe9403f717cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_606d3ae6b6981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevibija.rf.gd/jakam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5142b67-7337-46ad-9a43-e92d0c51dc9b/microsoft_project_training_free_online.pdfIn PDF document text
    • http://binaxasomeroxat.epizy.com/epilepsy_triggers.pdfIn PDF document text
    • http://ruzowedomox.epizy.com/gewaxasezekerofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce492ba-49bb-420b-a0b1-70947b796035/native_instruments_maschine_mikro_mk3_manual.pdfIn PDF document text
    • http://rufowafom.epizy.com/12v_buzzer_datasheet.pdfIn PDF document text
    • http://kazivaf.epizy.com/performed_or_accomplished_again_crossword_clue.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/93562174956.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/stress_transformation_from_cylindrical_to_cartesian.pdfIn PDF document text
    • http://nitaremam.epizy.com/72527696458.pdfIn PDF document text
    • http://gigemubirovivo.epizy.com/wepufuzeralu.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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5060 bytes
SHA-256: addfc32a7506273316066b83340da5c8488659f7b4a855852882349379343794
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10880 bytes
SHA-256: ab387d35120a22ddd0640c2e9a80ed7e6836d828ca0e37d6caa5417b67c389ae

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