Malicious PDF — malware analysis report

Static analysis result for SHA-256 291c39e29b618b0e…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 03:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: baa8d9bce17fa632901a19325c7c6abb SHA-1: 5088614a70e66986ac384a79c084dc7ede654c2b SHA-256: 291c39e29b618b0e2848b8f79b34ff820e51ac1dc469f74e40b7e75ba06ed4d3
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 0.9994

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://seumenha.ru/strik?utm_term=how+to+silence+a+westinghouse+microwave PDF link annotation
    • http://senukekufop.iblogger.org/all_the_things_you_are_piano_arrangement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_602482fe10142.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/2bacd962272a7.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/67984f255.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/kubobizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494451/normal_5feb73e871ed8.pdfIn PDF document text
    • http://bozabanafuz.22web.org/elephants_have_wrinkles_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_601f6fc097c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_600dc7b09f0a1.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/999940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_600b36a19dd8d.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/6cb9f534-f2a4-4b95-908b-35de66310384/jususeriza.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/bepavububuxudomiki.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/xavub.pdfIn PDF document text
    • http://piwunutid.epizy.com/my_android_tablet_has_become_very_slow.pdfIn PDF document text
    • http://bakutogigu.rf.gd/best_lightweight_reader_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7309c2ab-b3b6-4202-8eaa-2c4d44c09d72/self_presentation_in_english_job_interview_example.pdfIn PDF document text
    • http://zasupafevi.rf.gd/kezoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db69d661-4775-49d4-bd9f-b28b990f40ed/lt_code_on_delonghi_ac.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/rukutibolilijuboti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bed91a40-3da9-4795-b125-a2cc5a2edbb5/do_you_need_a_saltwater_trolling_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47c6a6f-98a2-4309-a88c-6a2411e0a1e6/pajavejenubomom.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/australian_government_nutrition_guidelines.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_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 5328 bytes
SHA-256: b5e5b1991eba5d165968a03c9ca2e56e3889e36e866020ad2266252dd5b671ae
font_01_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 10856 bytes
SHA-256: 0aaf4d80ab88be216d0e1a372335eb851c12174fadb94c007dd22089effecc53

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