Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25339a4ba135190…

MALICIOUS

PDF

80.1 KB Created: 2021-04-12 06:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c8bb988d9ae0b3c3d2027778d9383f9 SHA-1: a33568ea1f8f77da5a22753af03461364c2ec9ca SHA-256: f25339a4ba135190ea91eb4078e1e4fee135a0ef1d03edf3d3d713c27d9481c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it exploits PDF vulnerabilities or uses embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=yamaha+portable+grand+dgx+640+price PDF link annotation
    • http://rutekotugu.22web.org/pen_testing_report_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602b7f78d2614.pdfIn PDF document text
    • http://morpeoplelife.ru/903034508385q2i2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_6009121628c2b.pdfIn PDF document text
    • http://testertumentum.space/which_of_the_following_is_not_an_example_of_verbal_communicationeu311.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_605f8ef3c1eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_6011ce45aa83b.pdfIn PDF document text
    • http://viwizuzul.iblogger.org/14656619971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_6052ae731f44a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_870b7cc07fa449f4b5d31a60ca906113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb5074d-9ea3-4559-8a83-a646972abfa5/57225358035.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_71a058f0a8ef4b51a78772924ba48206.pdf?index=trueIn PDF document text
    • http://xowudibopope.epizy.com/surah_ar_rahman_latin_dan_terjemahan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430aa98b-a032-4f89-a0bd-ab72b4d20b26/40707727816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b113094d-4c4f-490e-9f05-2155e66ca44c/55125233772.pdfIn PDF document text
    • http://bufareloxejigu.rf.gd/mebizurem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/376f3521-bf25-477f-9447-ada002c36f2b/dyson_dc50_motor_not_working.pdfIn PDF document text
    • http://suxosimuji.epizy.com/2020_19_boston_celtics_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6622c6-54ed-40ea-b328-ded306848426/90451346876.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_fe0f0d1c9c2143908314e92abc58b01a.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_645fc292973a4180bb606d46483a2ac8.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_cefda410d153413a91b1c6c2eb85be04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c9bd17-7ec0-4269-a396-b18334b3ebe4/value_based_education_essay_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d18cf0f-e850-4a4a-b43c-9721b8aa3229/78006995751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43266fc7-a036-4af5-8b6d-f142faf6e585/how_to_speak_english_better_for_beginners.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_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5864 bytes
SHA-256: 81bb1647f291e9a2b57da133a45d02696cef45d69ec284cb8f6e9091a0a3158b
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 11208 bytes
SHA-256: 1d475e9e864e998619e9c0980cfbda3983bcd2c0f7f049167b4dc900cebbeea6

Open this report in the interactive analyzer, or submit your own file for analysis.