Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b057572dfcf09f…

MALICIOUS

PDF

83.6 KB Created: 2021-03-12 16:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 453b4f61ff8b8092fac42c7b4c60e2bc SHA-1: 4626e4cb79e74590a5d74f16d96d83a50e144031 SHA-256: a8b057572dfcf09f622f222a0c1b03e7dfbcaaa63d266853cbdc91b1bfdd6546
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and a link farm on disposable hosting. The ML classifier output of 0.995415 strongly indicates malicious intent. The file likely serves as a lure to a phishing site, leveraging a redirector to obscure the final destination. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/6ef6dcb5ee8a365.pdf.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=fall+creek+gorge+nature+preserve+indiana PDF link annotation
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/6ef6dcb5ee8a365.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/egejXid/oye_cuba_apk.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/fa19833fba9e61.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/pidinomipawoxufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60289d8c90a90.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/gesogazefi.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/what_happens_if_i_only_eat_10_carbs_a_day.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/6187018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_6003b6d884c18.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/experimentacion_en_animales_y_humanos.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/dekojomatagagugik.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/Jzhjjfi/examples_of_carbohydrates_brainly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412763/normal_5fcdf964d7047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_601b8c4608ccd.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/doxexitoninapew.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/ulmgdeo/old_man_s_journey_xbox.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/ozFjbhf/62440380023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_603fb39e2919f.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/who_can_be_trustee_as_per_indian_trust_act.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/muvat.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
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_6497cecbe5574524ad2b1a71fb9ab0a9.pdf?index=trueIn PDF document text
    • http://fepusum.onlinewebshop.net/criminal_justice_system_in_kenya.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_a31341982f644c9a83e3d59045db0420.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_95040046497d48d680eb4c700d938edc.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/68054973288.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/epidemiological_research.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 5200 bytes
SHA-256: 9dc8bbc07dc162bb8d80b1c214fdbf545441976812bf364f363c842746d0202b
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 10720 bytes
SHA-256: bd422ddeb05c070cb01773cce7703436fdea4dc1c2d0cd8c5e2529147eb41bce
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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