Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7857bf69db884d4…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 09:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a9d1a7377da6e92029c8ef4b7380b23 SHA-1: 1024b9fea8c0b2a63a8ccc392d888f45e3db7b9a SHA-256: c7857bf69db884d40ed511350563f2ced16b2b61ba27dc60636a9f12c6673a0b
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 0.9989

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://dafemum.ru/123?utm_term=bhagat+singh+wallpaper+full+hd PDF link annotation
    • http://yandex-delivery.cc/fekovapuwakixadifozov96msi.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/ethiopian_turnover_tax_proclamation.pdfIn PDF document text
    • http://life50it.pro/64951402344nconw.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/introduction_to_machine_learning_ethem_alpaydin_download.pdfIn PDF document text
    • http://raifaisentapp.online/getty_images_freevnhjt.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/catalogo_natura_ciclo_8_2020.pdfIn PDF document text
    • http://jumpfs.space/akbar_birbal_stories_in_marathi_freer0rb2.pdfIn PDF document text
    • http://tortomsk.ru/migumofenosb7gcg.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/arduino_servo_projects.pdfIn PDF document text
    • http://white-x.fun/60985074554xfsdx.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/5686583503.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/primeros_auxilios_basicos_segun_la_omsxmh14.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/nafes.pdfIn PDF document text
    • http://astrology-personal.online/nirejidudikabuxvrled.pdfIn PDF document text
    • http://strgb2.ru/malamowezikubenulirurirodgzxkq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fakuguvil/juduruki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/806760cd-ce03-42a1-a4ee-212ffd0cf28c/what_makes_your_food_taste_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/53199490314.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/29125287113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7962d194-651b-4e7e-9915-9bf818fd20c5/4017844419.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/xakuzuzixig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1008f9-ff82-4e40-b2a8-60f2996da02d/how_to_adjust_rain_bird_sprinkler_distance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59d38eb-5ae8-4a67-ba5a-6f9471e40373/81732893255.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/83705647319.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5216 bytes
SHA-256: 6a4b575bea0267907de49a863863838e91ee1af90efc0b36215a61a59c80bc3e
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10512 bytes
SHA-256: 4850d30f1126f4312a0eb2ae7b76dfbb1509b3cf6d46c370315d9516a7f1b4ce
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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