Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9e47bc7cc3c0f7…

MALICIOUS

PDF

83.9 KB Created: 2021-04-28 06:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e13307797007adec3aa01cd9f2459fff SHA-1: 0b379f2cf86f26c3a8f4b953fd0ce925085baab9 SHA-256: 9e9e47bc7cc3c0f74230ac411de540586f30202a8ee920862469bc88f404fe2a
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 phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or SEO manipulation attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=one+night+promised PDF link annotation
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/wuzeriju-mulaledi.pdfIn PDF document text
    • https://romiwewigases.weebly.com/uploads/1/3/2/6/132682929/nokezixejiko.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/8d05b56d3d2dc9.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/pulavixapuf.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/subcutaneous_and_visceral_adipose_tissue_structural_and_functional_differences.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/refatefupujewapo.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/where_to_buy_bradley_smoker_parts.pdfIn PDF document text
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/3e082c0876f41e8.pdfIn PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/3312862.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/29263576934.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/gastric_bypass_pre_op_diet.pdfIn PDF document text
    • https://fadafiwu.weebly.com/uploads/1/3/5/3/135302778/4d42e77d3899d0c.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/zobeziva_dagele_xiwenozetaf_wesofof.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/is_powerline_ethernet_safe.pdfIn PDF document text
    • https://wedufejaf.weebly.com/uploads/1/3/4/0/134018106/3479017.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/80075e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_e1c06c9250e04c869672f90ae7bf3ef2.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_d2e26ead63b944a8966b6e75af9d46d2.pdf?index=trueIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_f7677eeec61345e987244aa8243bb82f.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_43361e48c9be49b2a491abd5e0ab58cd.pdf?index=trueIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_c7d10e0e8cdb43f3a3d74f180f7b2cd7.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_67844cb826e24f12a18e3e6b989b2ce7.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_2fe36e0885cb4534a31f1debfc553b48.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_d397014d71c7438c9113a54c2e546d99.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 5156 bytes
SHA-256: c5acb32386b7911a48ec5b30c1bef3c0a19f8de4dee96d5952b79bbcf72e64eb
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 11384 bytes
SHA-256: 1047436c38e5adef4ee6902c85a3b3a9b4558df70f244a637fb7dae6ef9d88c8

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