Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a87b080d93049d4…

MALICIOUS

PDF

119.9 KB Created: 2021-03-18 14:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd41f26f8927ae36dd7ca40bc6d8dbfc SHA-1: 089761862ea0fcbb0a953aca31aaebec32c4b898 SHA-256: 7a87b080d93049d44ed12bfd1fff848fe6e942f97b76e017d4f808991ad0e120
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=feasibility+study+sample+food+products+pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of malicious URLs and the document's deceptive content suggest it's designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wix?keyword=feasibility+study+sample+food+products+pdf
    • http://zegererevez.medianewsonline.com/44957766351.pdf
    • https://cdn.sqhk.co/varugefezum/ghigjjf/ripixuvuwovixabari.pdf
    • http://sopisafexuj.sportsontheweb.net/bitir.pdf
    • http://fukuzowi.sportsontheweb.net/what_is_the_plot_summary_of_alice_in_wonderland.pdf
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/6420566.pdf
    • http://fezelegafefuv.mywebcommunity.org/91674600169.pdf
    • https://cdn.sqhk.co/busanurutar/W8EKlRQ/surface_area_of_rectangular_prism_formula.pdf
    • https://vusugurubem.weebly.com/uploads/1/3/0/9/130969976/wuwonimotivosawox.pdf
    • https://cdn.sqhk.co/wadupaxi/pGYtBja/4x4_off_road_racing_game_download.pdf
    • https://rorumelet.weebly.com/uploads/1/3/5/9/135969221/4322960.pdf
    • https://cdn.sqhk.co/zezegawutogu/iejdibk/dutuvafugoxavuvuza.pdf
    • http://zutatowatipo.mywebcommunity.org/44268688406.pdf
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/4960908.pdf
    • http://libuwapuvewipev.mywebcommunity.org/biwi_ke_huqooq_in_islam.pdf
    • http://gekenig.mywebcommunity.org/australia_continent_political_map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fofeguj/gaelic_name_pronunciation_guide.pdf
    • https://s3.amazonaws.com/banula/mupado.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_87f0d24a070d4f89959bf4d469f8b32f.pdf?index=true
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_975f5e981ace43e4881dbe1f3b03c3b6.pdf?index=true
    • https://s3.amazonaws.com/makumapikeze/spelling_inventory_feature_guide.pdf
    • https://s3.amazonaws.com/tamobalasu/urinary_tract_infection_guidelines_australia.pdf
    • http://siniligavaxuvul.onlinewebshop.net/tenergy_lipoly_battery_smart_charger__bms_unit.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_8f548d571e2a40328c85a4142f1ea3ec.pdf?index=true
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_487884e6adf84c3a80513d1fe47dcd25.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019749.bin
676c7195a9eb0f630491307db078b3677661615861f14117b010995e8fa1500f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19749 5496 bytes
font_01_sfnt_off0001a9e9.bin
2417e427045091d23e56599256deeea25d0690ec8d78ef98febf6f213e97a2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9E9 11520 bytes

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