Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7fe9f707f0d002…

MALICIOUS

PDF

82.4 KB Created: 2021-03-29 07:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cdd4b191ea6a977c2ba903f59e583693 SHA-1: f4279facdb9325bd2c85549068aa65ccdbc766fa SHA-256: 0f7fe9f707f0d0027678512573240a2dec8465df2c71cab3edbee9ededf40dfa
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing lure or malware distribution point. It contains a large number of embedded URLs, including one pointing to known malicious redirector infrastructure at 'dafemum.ru'. The document's structure suggests it's designed to host a link farm, potentially leading users to exploit kits or credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/award?keyword=amenable+group+pdf In PDF document text
    • https://xejuzofuna.weebly.com/uploads/1/3/4/8/134858051/4011811.pdfIn PDF document text
    • https://reguzuseja.weebly.com/uploads/1/3/2/6/132695615/9670345.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/bhcifoy/indonesia_business_visa_on_arrival_batam.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/bozinuxeba.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/how_to_use_viewer_in_jio_phone_in_tamil.pdfIn PDF document text
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/riwilusoxufewofofi.pdfIn PDF document text
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/285462.pdfIn PDF document text
    • https://dutimuju.weebly.com/uploads/1/3/4/3/134334277/geridu-senimupiva.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/jf2xagc/64009862700.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/supabuwijikotus_risev_fegosis.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/qcy_t1c_review_reddit.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/68201632228.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/83a2c1b7-fb50-4e33-b1e0-2295b7cebf61/90482839017.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/transformational_leader_definition_leadership_style.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_2be4be6066c34adb960ef7295f9cb455.pdf?index=trueIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_e1d877e24377495bbab47a55c4424162.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da746a0-3edf-45b8-b0d4-dc87d44fe0ca/15550481647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd2e9ca-3dd8-4c86-a61e-1cae997eb47d/26517886596.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_0b7254747c464e2d861889d12cd40c9b.pdf?index=trueIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_2f31dd57794641149bf254653372bd7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25244378-33d0-453c-b8ad-9a4135c8b4e8/gaziruwelutezukabupef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112b54ca-7bd6-4601-bdc2-f3963bfd1129/kali_linux_free_download_2020.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 2912 bytes
SHA-256: 379102226829f3bab3a3c763e92e857047a50d0750f2cd7a3c42e86eaecd7746
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5312 bytes
SHA-256: 9c307e6e459b08c75e8c61a0cf73d308c6bded0cc87ba09dafdfb31c4c51db8c
font_02_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 12852 bytes
SHA-256: b495d723a96647f4606ce84ed0d3c5332a3a31d8fe958b760ea6967a0353ba1d
font_03_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16608 bytes
SHA-256: c336211425d94eb7ad227432c68ef3d1348c8a804edd9265b6a97f7a275c66df

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