Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b06687ebf2ad09…

MALICIOUS

PDF

75.4 KB Created: 2021-02-20 20:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6ffd798228d33a974b4bd34da2e581b0 SHA-1: fa775dff74fbdf622b74916706b3772d5d048c33 SHA-256: 43b06687ebf2ad09eb2a7b73662566bba7baf1338af801eaf48731e1b891c266
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several heuristics indicating it functions as a link farm and a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://yafferge.ru/wix?keyword=tipo+de+educacion+fisica In PDF document text
    • https://cdn.sqhk.co/mutexeze/jhoQhhy/steamship_authority_parking_permit.pdfIn PDF document text
    • http://pezisafepogux.22web.org/synaptics_touchpad_driver_lenovo.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/chfC67V/58378001004.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/hWYGXge/spectrobes_origins_walkthrough.pdfIn PDF document text
    • https://kedaweva.weebly.com/uploads/1/3/4/8/134895813/zufosavisidog-vawufete-raripe-bubebon.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/HEG6hcP/neighborhood_walmart_pharmacy_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/gieeihx/vitamin_b12_injection_cpt_code.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/jghbjhm/city_racing_lite_mod_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/idh5ibd/mulatekemem.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/642f3b1bb91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/beyblade_cartoon_wallpaper.pdfIn PDF document text
    • http://zoxumatodemake.rf.gd/best_pakistani_movies_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/letter_from_birmingham_jail_assessment_answers.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/islamic_call_for_prayer.pdfIn PDF document text
    • http://gizenelik.rf.gd/free_willy_song_will_you_be_there.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/51052667345.pdfIn PDF document text
    • http://rijogutigoxek.epizy.com/96821325387.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/54392093979.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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 4972 bytes
SHA-256: a0d17aa1015de9a40b8bc7d64b9d37829262f6291ce3fac8d55ec4d8d721ae66
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 11740 bytes
SHA-256: 1a1390f17b2861f8b18955aebd96860821d579d7e79a4f4e6dddda875158e76f

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