Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3d63abe6d68186…

MALICIOUS

PDF

78.7 KB Created: 2021-03-27 12:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 59565f5e2bcdf6275607076db2ace4a2 SHA-1: eadb593d952e6c014df7e72c0382345e42aa7170 SHA-256: 6c3d63abe6d68186af64714ae4b3baffc85e03d472e249b2ccf8ff6802f90a76
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, constituting a link farm. One of these links, 'https://crophysi.ru/strik?utm_term=gardner%2527s+theory+of+multiple+intelligences+examples', is identified as a malicious redirector. The file was also flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier, indicating a high likelihood of malicious intent. The primary attack pattern observed is the use of a malicious document as an attachment to lure users into clicking on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=gardner%2527s+theory+of+multiple+intelligences+examples In PDF document text
    • http://gejokakop.mygamesonline.org/download_novel_bastard_devil.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/tjdIDkq/python_3._6_for_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/Khfgjha/tesubibosiba.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/WgfM76E/oconnors_bar_doolin.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/8LagfDq/puzzle_bobble_online_game_full_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/QrheO8H/modern_warfare_2_2021.pdfIn PDF document text
    • http://english-10.site/best_tech_tools_for_writers7qrdj.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/ygehcgj/vinoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vajegipofuz/ogcqjbN/bombastic_antonym_meaning.pdfIn PDF document text
    • http://manybigs.space/68937871613vlrn7.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/anxiety_test_scale.pdfIn PDF document text
    • http://bestunew.xyz/how_to_get_first_aid_certificate_in_philippines6jf4h.pdfIn PDF document text
    • http://lamisorosasam.mywebcommunity.org/what_do_you_understand_by_the_word_free_will.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/SgeKjcH/nuke_em_all_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_5b282bd7c9b749eba906b925bff8aba4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/86051264568.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_2aee1c315611423797b0dbf43216f251.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/ps_ainda_te_amo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/balabavazumibuxidabutiwa.pdfIn PDF document text
    • http://tujupifirafadus.myartsonline.com/gipodekupokexidog.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/mulexubebogumupi.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_4a1387fbbffd498d9be3a87b884f6e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/sopelomipamadumepamaluti.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_8e284755741b4ee586ffb3e4d514489e.pdf?index=trueIn PDF document text
    • http://nekelaxowe.atwebpages.com/simple_present_tense_game.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 5804 bytes
SHA-256: 7f2c37d1a4cb3bf3c37868801731ec7e4216ad40f8c26a89ee1ee383f64f7027
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10628 bytes
SHA-256: 50efc0e593bf0b9ed6c65b1da497ae073bdeb7e63a38c3b78c18d70645bd0cc2

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