Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbc7e7ca4feb4f0…

MALICIOUS

PDF

79.0 KB Created: 2021-04-21 04:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1fe6ab52f0ea158c1149d0070e9c6f10 SHA-1: 793ef3c77fce4b050ede2ebef11428d89d4657eb SHA-256: 9dbc7e7ca4feb4f037418a04fb2e26d8c37e083bed2b271f7119602143adfbf6
184 Risk Score

Malware Insights

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

The file is a PDF document containing numerous embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://crophysi.ru/strik?utm_term=student+information+sheet+elementary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b4087bd3.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/jbZhgih/world_beautiful_girl_full_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/xhig0jc/celestial_seasonings_bengal_spice_infusion.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/Miigg6k/fegalinilodogeremo.pdfIn PDF document text
    • http://digovin.getenjoyment.net/deductive_reasoning_tests.pdfIn PDF document text
    • http://rokexulom.22web.org/bosufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_5ffe48d7b9a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fe3670ef3fd4.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/shredding_diet_plan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fc911d666942.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/YSH2hhW/42035960152.pdfIn PDF document text
    • http://megiloreb.mypressonline.com/39719614407.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/66322665754.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/phgjgHO/escape_plan_1_full_movie_free_download.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/luxaduzimase/55606514510.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/molecular_quantum_mechanics_atkins_free_download.pdfIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_49c6b9b9503a49bf922afc2a371d7932.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_4296065217dd4375bcebd9a210f64c76.pdf?index=trueIn PDF document text
    • http://fudojozijenabux.epizy.com/canadian_food_guide_chart_2018.pdfIn PDF document text
    • http://rikexulekoj.epizy.com/xidojikomiwenu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/jexodo.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_87bb42377e3a427abb4c023c37cd2f1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/soxivenavomezive.pdfIn PDF document text
    • http://rarovuvoj.epizy.com/24522258232.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/bojafujumez.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_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 5352 bytes
SHA-256: f64af8e8a932e21d3c3ead3c3e33c3b6a946b8d9815ec6f484aaa903cc000c23
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 11216 bytes
SHA-256: f3bce1a99dd91345fe7686e66a5d5ade548992fd83d9e8b2f58c2793ca0b311b