Malicious PDF — malware analysis report

Static analysis result for SHA-256 2500e7ae9b9138d1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 04:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b1393a269a9dd5263617fedda210a871 SHA-1: dda739cc2c3647b9e8a08a8c5f86d2649e535e2b SHA-256: 2500e7ae9b9138d156863e05018e6a38e96ef9ce2c0143ff06e681992d57d347
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=probability+with+combinatorics+worksheet+pdf PDF link annotation
    • http://pexulisinipev.sportsontheweb.net/66837658398.pdfIn PDF document text
    • http://laxelenokuro.22web.org/97639030330.pdfIn PDF document text
    • https://wifebazeb.weebly.com/uploads/1/3/1/4/131482826/demilekutobolo_juwefa_jusuripekiba.pdfIn PDF document text
    • https://pobanebutu.weebly.com/uploads/1/3/4/5/134592169/9863748.pdfIn PDF document text
    • http://lajenasuwo.iblogger.org/assassination_korean_movie_english_subtitles.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/mukatutegusituwu.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/poxuwirerumix.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/homelite_super_xl_automatic_oiler.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/fapafizegeto.pdfIn PDF document text
    • http://wemokeledezo.iblogger.org/is_add_worth_it.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/c01ab472-591e-47af-af69-8d72a7b39406/teteniluxivugivivijazini.pdfIn PDF document text
    • http://bapexuzajo.epizy.com/fafegekifoguvebazikepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28dae97-6a46-4a40-b638-92d6c52204e0/how_to_make_a_hydraulic_tube_bender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c2ab80-a4df-49f2-809e-6400e043686b/maxiscan_ms300_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ce273b-ce56-45b2-84fc-499ddfacd689/dinegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe69e6d6-3904-4420-adc7-8355bd210413/48647102210.pdfIn PDF document text
    • http://nowutakifotekes.epizy.com/6349269450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95c6279-d513-4515-9bbe-1c4cdb8c6b3e/magic_tree_house_books_how_many_pages.pdfIn PDF document text
    • http://genolesatoj.epizy.com/fibaloze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7daef-4e2e-4ec7-a51a-3d64a41aa29f/best_machine_learning_books_quora.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5796 bytes
SHA-256: fd0ba481f56e1c4bb78f2ebf4a1b44af3bef2207350105c43db0d845b12ac7be
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 11356 bytes
SHA-256: 7f42ea5adb93c8c0a18d5ef48ed7487f855bdef15644e40e67153ab9ff9890a8

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