Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade07d0e5603f4a2…

MALICIOUS

PDF

101.1 KB Created: 2021-05-01 22:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a2a3f5e77d67730139db3d77acf1734b SHA-1: d6953703285cb06252f0b2994ec1f50732975056 SHA-256: ade07d0e5603f4a271a0ef281234720c8fd973c4daace9724107182f8d2e2dc7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://jumiwimov.ru/strik?utm_term=adding+mixed+fractions+worksheets+5th+grade', is presented in a context related to educational worksheets, likely to deceive users into clicking. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate malicious intent, possibly leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=adding+mixed+fractions+worksheets+5th+grade PDF link annotation
    • http://tidirakozodawon.getenjoyment.net/giburim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6020f8e071728.pdfIn PDF document text
    • http://motubudasuvapan.medianewsonline.com/63644144915.pdfIn PDF document text
    • https://xofijenafoku.weebly.com/uploads/1/3/5/3/135349300/digijozevun-vijulu-bezil-tobotuwazewadi.pdfIn PDF document text
    • https://batujesidow.weebly.com/uploads/1/3/4/6/134666028/2364551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6027b2dd78ec5.pdfIn PDF document text
    • https://gininigexaviw.weebly.com/uploads/1/3/5/3/135350692/betafapu_jigatawajasuxum_biweworuru.pdfIn PDF document text
    • http://nirenodeba.medianewsonline.com/jurnal_pingsan.pdfIn PDF document text
    • https://bunofavaluz.weebly.com/uploads/1/3/4/6/134661637/lapunegak-jakakor-livuvimaruzod-goxilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_6023a711ced90.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/microcrystalline_cellulose_properties.pdfIn PDF document text
    • https://fudosabitewixo.weebly.com/uploads/1/3/1/6/131636852/5448479.pdfIn PDF document text
    • http://javifimawa.mygamesonline.org/switzerland_tourism.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://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_c4a41805b3034201bc3cfc3bc5ed1df9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/what_is_isocost_and_isoquant.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/paises_con_forma_de_gobierno_republica_centralista.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_8e1382aad6af4634b3773a10645ca199.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/chiru_kannada_movie_ringtone.pdfIn PDF document text
    • http://xisuwujilaxemer.myartsonline.com/firozazituridogevamaroxo.pdfIn PDF document text
    • http://wetukanezin.atwebpages.com/freenove_ultimate_starter_kit_for_arduino.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/dozefojirafulovowifej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 5528 bytes
SHA-256: ff5b2fb78ebeacbd95cfaf64e60993fc0680fb5a380e20704b7f6229bd65021c
font_01_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 10576 bytes
SHA-256: b1f4b053d4119c45827a5128ae785225085901bb97e919bd4e20b9a983e8649e
font_02_sfnt_off000162f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F5 16176 bytes
SHA-256: c392189ff328babef707e661744462cf1107ff2c7c99b7449997d6791772008b
font_03_sfnt_off00017821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17821 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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