Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67640a54298f774…

MALICIOUS

PDF

75.3 KB Created: 2021-03-28 07:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 77fc7c0809fec13a7417e9fefa70fa9e SHA-1: c3a39c017f7a638bde93b20b3351977203444f06 SHA-256: b67640a54298f774c09062d1c1d5883d8a5a68a400240f04b00315452e5ca83a
254 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and SEO link farms, indicating a phishing or spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=pop+ceiling+design+photos In PDF document text
    • http://fajujefa.getenjoyment.net/area_problem_solving_worksheets.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/magill_r._a._aprendizagem_motora_conceitos_e_aplicaes.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/bioremediation_of_soil.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/60774855971.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/maintain_automatic_teller_machine_atm_services.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/wofabevikakototubejugij.pdfIn PDF document text
    • http://kolekewoni.mywebcommunity.org/murexunuloromarowopiba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_8d8848ef4f834edfb032d0a08f6a3ba1.pdf?index=trueIn PDF document text
    • http://fetekovabu.onlinewebshop.net/berlin_definition_ards.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/buwofekigov.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/majupenatowugegorozo.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/adpro_xoa_client.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_9630f38f37ae4cb3a56696b71f898c87.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_98e0d332fc4a4d619524fbb70f176b4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/marketing_plan_template_presentation.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_3b50b3a5cc6a48a09664fc42f0e0b6c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_to_reset_a_norcold_rv_refrigerator.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_6ff70e2f8f094504aaf17289f6ba16bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/anuradhapura_today_weather_report.pdfIn PDF document text
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_308e6932cd3c402093b63f8f87f06be3.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_f96ea409087943b4b411851a933ba979.pdf?index=trueIn PDF document text
    • https://78f5967e-1348-44d0-b43d-4fba71d4c3e7.filesusr.com/ugd/a94f6a_2a6643ada71f461ca25181d80ad2a0ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lunojol/5064146948.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/feeling_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/hello_tune_application.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/bitdefender_windows_server.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5028 bytes
SHA-256: 9130bf48c9a290341036757b7ba942ad48a11f95ccaa320bbac7c1bf23e4cd1e
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10896 bytes
SHA-256: 02a819d3310366c0a57e8a235a0b30a550c40f9364f5da7f3eb4ba2fdac2954e

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