Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d675f036ccdcff0…

MALICIOUS

PDF

78.8 KB Created: 2021-03-06 08:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e0f899745d85968a42c5493c317ea594 SHA-1: 3a279bf29b2091ec8110436f8d1ed034de0fdce8 SHA-256: 6d675f036ccdcff083b711c5883a309b0483577c179303d0c8a0ac9bb554195c
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a likely phishing or SEO spam campaign. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/aws?utm_term=types+of+practical+criticism In PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/fewez-piwuxapal-kumifetimej.pdfIn PDF document text
    • http://majikok.mygamesonline.org/apple_airport_express_gen_2_manual.pdfIn PDF document text
    • http://sfr-webmail.com/vezavasanuzaoode5.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/wapefiliru.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/1572107.pdfIn PDF document text
    • http://begemotiks.fun/literary_devices_examples1f9r9.pdfIn PDF document text
    • http://tibetterrier.ru/76457041889f8jlb.pdfIn PDF document text
    • http://drovazvenigorod.ru/logitech_m325c_mouse_not_working_macqpmvp.pdfIn PDF document text
    • https://vinazova.weebly.com/uploads/1/3/2/6/132695356/25999.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/11939651623.pdfIn PDF document text
    • http://mydenverneighborhoods.com/telugu_panchangam_calendar_2020_downloadm85ot.pdfIn PDF document text
    • http://graatorama.space/wujiwenunizdlhz6.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/wazuxafawulola_koxuxiv_telumujuwapelok.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
    • http://zijiwaras.onlinewebshop.net/89200750387.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/the_game_awards_2019_winners_and_nominees.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_b5006e6df05847f98707d6bcd844546d.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_cb4251f2da9d4a41ba4dab2ae7451a87.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_2ee36761adbf41a489a7f3470ca6bbec.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_4228d27ffa3e4dd1aad4010285c24f5a.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_e32d1e9140234b46b533f4dc75556f2d.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_515cc0d7a05146ed8286cf2b552d7c92.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_54041381149f410ba87ed144d636f378.pdf?index=trueIn PDF document text
    • http://pezefaxovojole.atwebpages.com/sas_macro_interview_questions_and_answers.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_2e4fefb645444c8487dc06f4d41a47f2.pdf?index=trueIn 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_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 4896 bytes
SHA-256: 01ac2217bb21b87e603f9aa80865a35ed35da29ae27bac46ff310ba17fd9aeb7
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10164 bytes
SHA-256: 6cfe8da72dea6d551e80a36ee1e740ed679dc49e8051f85642f24294a35a867c
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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