Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8edd75f51d3aa2…

MALICIOUS

PDF

70.1 KB Created: 2021-02-23 13:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44dbe318e1226df7849514ad0a4ef507 SHA-1: d999f1e0d38fafbd55f47c01861a9eac6db7cf67 SHA-256: 3e8edd75f51d3aa241653bcf59c581860ecdf23d795a4bca747c2ac97303c861
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=how+to+make+a+yamaha+gas+golf+cart+go+faster
    • http://hdvideo.design/kasulumosef3jvwg.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/kenosurirarasax-soritudadaru-buwerajagis-mikunevipik.pdf
    • https://cdn.sqhk.co/numanazolov/DuH8Mje/cooking_fever_cheats_for_pc.pdf
    • https://cdn.sqhk.co/revikokelobu/Wjachhf/99582360654.pdf
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6019c31e9eef5.pdf
    • http://pubggaming.online/vaverizewiwawiqxf7t.pdf
    • https://cdn.sqhk.co/zolilobup/ijYijhi/xobipuwonowogomugu.pdf
    • http://tehnotop.store/304251440198iqik.pdf
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fe543391446b.pdf
    • http://roflan.site/quimica_inorganica_gratisool49.pdf
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5ff158cd21b9a.pdf
    • https://cdn-cms.f-static.net/uploads/4471995/normal_603250911805d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxuvagal/what_does_the_word_man-at-arms_mean.pdf
    • http://xivegujox.epizy.com/aria_triunghi_echilateral_formule.pdf
    • https://s3.amazonaws.com/zalisujezajaje/vowalaledimudazugetikudor.pdf
    • http://bixuxopot.epizy.com/betejiwugibitiriwuwewera.pdf
    • http://jumerajoge.epizy.com/manualidades_con_cartones_de_leche_para_navidad.pdf
    • https://s3.amazonaws.com/vapelurowar/ketorerulepeguti.pdf
    • https://s3.amazonaws.com/fidefofudi/christmas_songs_piano_sheet_free.pdf
    • https://s3.amazonaws.com/kitakilesa/characteristics_of_information_resources.pdf
    • 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_off0000d536.bin
e2e95a9175cb30c01cbd1a8123503fe50300a0b6746b1d3dc4126d4d8d7ddcf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5516 bytes
font_01_sfnt_off0000e7e8.bin
4287977f35e7d6c8570afbc399fd543d05df0e36c794dbceecfea25aa56473b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10372 bytes

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