Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aed4e5688c062c…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 19:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79e814b8d9627160d34ea6c83dbcfed7 SHA-1: 840033549b1f8b92d09cc9e5e764a14ce0ef1013 SHA-256: 23aed4e5688c062ca9bcbd2b662bfe48fcbc55c5120c7e30a02a1de8cd7eaab1
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 0.9996

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://pelibifir.ru/wix?keyword=kingdom+hearts+quiz+event+answers PDF link annotation
    • http://xobukafa.iblogger.org/sirixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fdd099f26d23.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/KN7ehgl/vuzazijusuwomabuxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fc915c566f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6053c2bc1ebe8.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/BgdVkih/meridian_157_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_60151bd8de1f8.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/zibeginemod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_60372aad5e1e6.pdfIn PDF document text
    • http://pesizememol.22web.org/5691319707.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/31165982965.pdfIn PDF document text
    • http://zimarul.iblogger.org/42585124138.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/where_to_donate_used_toys_nyc.pdfIn PDF document text
    • http://rurojewof.22web.org/33433293040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_600dfe7a4eee9.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/prefix_and_suffix_worksheets_for_class_5.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/c1ZKIhT/48992396473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_602c218e2b895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_60383fb053332.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
    • http://wokasob.rf.gd/riluvetabolujigodinoguli.pdfIn PDF document text
    • http://rimutapewite.rf.gd/what_is_cfa_salary_uk.pdfIn PDF document text
    • http://bupazutorudazeb.epizy.com/fawut.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 5388 bytes
SHA-256: b46e7a66ffe7439e4e12a0decff174457679c75f6c2d683ce92f598a3f629e24
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10744 bytes
SHA-256: bbb1dcc445ad3b09af11b1de4a68051f0b18346a4928d41ae834266ea8f82454
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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