Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d3ca17f4ae4ae…

MALICIOUS

PDF

101.6 KB Created: 2021-04-24 23:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bbc507cc990659d9eb7301bca39a9514 SHA-1: b3f60cf7387a42ecdb8ffcd092fd2d3b02c8df74 SHA-256: 5c1d3ca17f4ae4ae11e190d7d2c935956acad826e7795ae243809ab0531cc8b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=digital+tech+merit+badge+book PDF link annotation
    • http://fewafef.iblogger.org/aaron_neville_grand_tour_free.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/gemstone_meanings.pdfIn PDF document text
    • http://xuroriwonufuz.scienceontheweb.net/84600383638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_60603d680e075.pdfIn PDF document text
    • http://gutufozif.iblogger.org/98870182263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387921/normal_60032546ada86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_60673c9f4d081.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/jee_b_arch_question_paper_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_605a73a646576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_600e350001dfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fcf5f4f43684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_27698987785d4c3690df29063eca2dbb.pdf?index=trueIn PDF document text
    • http://getetir.epizy.com/puvade.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_e3490c1549fa4ac3a298e3679969ab73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/26055960034.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/chrome_adobe_flash_2021.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_ea8598bec8284d319d89f54722ab0a8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/48610585415.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ac266582d2a94feb857fcf504e359360.pdf?index=trueIn PDF document text
    • http://wafazitowem.rf.gd/46777671060.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/panasonic_inverter_microwave_oven_h97_h98_repair_fix.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_45416ac629b54939b5ae682dba1fa589.pdf?index=trueIn PDF document text
    • http://zogosugo.onlinewebshop.net/piano_accompaniment_tutorial.pdfIn PDF document text
    • http://dukuzuwikisos.epizy.com/antihistaminicos_h1_mecanismo_de_accion.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 5380 bytes
SHA-256: b3fe0614588af0c3a245f69989273221a3f87dc6a080b1453121e401e353c95f
font_01_sfnt_off00014211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14211 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 11052 bytes
SHA-256: 8a150c4407708833fce3c53719ae54edf5340c5ae815b5ec7cd90b6d12332d43
font_03_sfnt_off00017058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17058 16620 bytes
SHA-256: b7fdacbabcfcfa34d41f42d8feea3c65b8dfd5dba84840f0d5bb4ad3802cb729

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