Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf458ff218bc740…

MALICIOUS

PDF

79.4 KB Created: 2021-03-07 14:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b013cb86364ef9a552f8a55aca23603 SHA-1: 6125036bff713b26323503bc4428f9d0886018f9 SHA-256: 0cf458ff218bc740caf9751136dae8beb0f824e1451168389802f50ecbd755b9
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://maypoin.ru/strik?utm_term=how+to+structure+academic+writing PDF link annotation
    • http://mibebar.22web.org/love_rosie_cecelia_ahern_espaol.pdfIn PDF document text
    • http://ygrash.website/roxewot88msh.pdfIn PDF document text
    • http://uose.xyz/amorous_dustin_guideevgz9.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/8615268524.pdfIn PDF document text
    • http://rasixojolebasug.iblogger.org/sogig.pdfIn PDF document text
    • http://sunny-web.ru/pilar_franco_aguilerayg19k.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/linexojiruxusuzenuged.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/bimazifexadoxanojak.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://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_cb23b3e9c3e040288e2fd6e0971f971d.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_910c94ec6ef5475ba6f70dc77a2562ba.pdf?index=trueIn PDF document text
    • http://wijonefisod.epizy.com/universe_10th_edition_by_freedman_geller_and_kaufmann.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a00ad04-0116-448d-a3fb-0de6f40aa314/video_games_to_play_with_friends_on_pc.pdfIn PDF document text
    • http://zazoruwokabaj.rf.gd/pozinezejijowobodag.pdfIn PDF document text
    • http://pakafadudu.epizy.com/digestion_absorption_and_transport_of_carbohydrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3cb8e4-674b-46b1-87ed-e4a45602fce4/php_html_hidden_input_array.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_0ac08f3ead8a4bf2b51a51e4feb97b7b.pdf?index=trueIn PDF document text
    • http://mogopubu.epizy.com/36169175850.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_cd92e7a53dc841ca8bb05920861e1cc2.pdf?index=trueIn PDF document text
    • http://xekabotiwuker.atwebpages.com/pedivukonorebimatok.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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5160 bytes
SHA-256: 1629b28d02921def14cee12a6c7f2105ab7b37c13343d2ba188ce72c28552485
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 11156 bytes
SHA-256: bbe94ae8666553f9baccb65bc012bd4f102a06f4e7dc2d25c8490f181af1ca21
font_02_sfnt_off0001225c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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