Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c98cbadfd778a9a…

MALICIOUS

PDF

119.7 KB Created: 2021-03-15 05:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c40082f529089c52b55810029e021fe5 SHA-1: fb6303879cfa777f2f909a5d96896143adb89e8e SHA-256: 2c98cbadfd778a9a751fa4c1666656c72d15bb6605e94d2234b5f5c6ac4ede82
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=alesis+dm5+drum+module+manual PDF link annotation
    • http://rusherx.studio/gate_2016_answer_key_physicslbcp6.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/ic_7485_magnitude_comparator_datasheet.pdfIn PDF document text
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/5409689.pdfIn PDF document text
    • http://salestore.pro/62053420350hpwrn.pdfIn PDF document text
    • https://firulasimasib.weebly.com/uploads/1/3/0/9/130969438/8200514.pdfIn PDF document text
    • http://wibubalitobidu.22web.org/kinetics_and_modeling_of_anaerobic_digestion_process.pdfIn PDF document text
    • https://riwivado.weebly.com/uploads/1/3/0/7/130739124/notovotipe.pdfIn PDF document text
    • http://mexicotop.xyz/rebilajokemilyap7e.pdfIn PDF document text
    • http://duwisodoginut.22web.org/mulwala_water_ski_club_gig_guide.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/67104553375.pdfIn PDF document text
    • http://vinnipoh.fun/pupetogiwozoforavenepemxgme4.pdfIn PDF document text
    • https://komamizidunip.weebly.com/uploads/1/3/1/4/131437982/6619634.pdfIn PDF document text
    • http://gnfcns.info/999509159bez9f.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/vovabagubajegeb/hp_pavilion_zx5000_specs.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/45168467047.pdfIn PDF document text
    • http://dijugotir.epizy.com/fabevinafewaz.pdfIn PDF document text
    • http://dudasuz.epizy.com/butepos.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/minikit_guide_lego_jurassic_world.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/boboiboy_the_movie_2_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/simifuburunivu.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/digital_tv_antenna_android_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18231 5084 bytes
SHA-256: 733a4d8b3c7bac01f615665ccd470922f06ae2b6e309932a3c3ebe78d724752a
font_01_sfnt_off00019362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19362 10632 bytes
SHA-256: 49604cb4a4049a10fe7fa3e22d3df16f34a057801e78ebdb348b1a7dce3d0c81
font_02_sfnt_off0001b7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D7 18860 bytes
SHA-256: 4e4344be078b3cedab58efb5430f087db14c90c081505825372f36173445fd39

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