Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10f16d95f1e5392…

MALICIOUS

PDF

82.1 KB Created: 2021-03-17 07:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8315ce3dbcd8cc14dd514918a5d9909 SHA-1: 9661fc901fc4f88f3c0084d9c88aa00a97ee79b0 SHA-256: c10f16d95f1e539242b608b2e1e96f9f2a03f9599cbad9c2c51c8b3a1614fe3c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://druttle.ru/wix?keyword=app2sd+pro+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385636/normal_6041ad1b9e39b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451742/normal_5fcb1d48aadcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/liwafo/99056855756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3847db-b0b2-4869-a296-4edf05529c8e/what_does_off_white_means.pdfIn PDF document text
    • http://sofijorube.rf.gd/aptitude_test_for_job_applicants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bd450f-9ebe-4d0e-8ec9-eb646f6c6359/huckleberry_finn_character_development.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/49384947013.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/proform_le_tour_de_france_1.0_fitness_bike_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a3586a-e66f-4b08-a44d-80d3d0e853de/livitobew.pdfIn PDF document text
    • http://mabaris.rf.gd/table_topics_game_questions.pdfIn PDF document text
    • http://kamiwivexa.epizy.com/61544619936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e556e5-7746-446b-a385-e38793ec8af9/nivoniwamakiwasip.pdfIn PDF document text
    • http://lagozim.rf.gd/92867237029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2853bdba-6e89-4687-83ef-691c02d86e6c/lumefedofetifimunub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 4972 bytes
SHA-256: 8519f2453812d7a37ad80733165354ca10843ff56d2eadf5e572ab2f7cc994f0
font_01_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 2328 bytes
SHA-256: 864cbe2c6973b44d2b71e19ffbffb2328dcb3759b07ceb43c11d5a372fc4956d
font_02_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 11580 bytes
SHA-256: 3c7ebe6662f672a48b05f407ae753968a4a897c34fd1500e0a4946cdd2ae936e
font_03_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 16988 bytes
SHA-256: 9aa3e85748dc2320d057f86d5cb77a3c182ea42be8ab01edbc54214b52234733
font_04_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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