Malicious PDF — malware analysis report

Static analysis result for SHA-256 48cf4f6a99a43246…

MALICIOUS

PDF

74.2 KB Created: 2021-03-07 11:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9690e6d9897574d37c53fe6366d8c648 SHA-1: 8600591855355fdd078179585a80907d2acb14a6 SHA-256: 48cf4f6a99a43246cbef55b53069d53e11d80cd373d598135fc907b470cf5a7c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to programming a Sony universal remote, which is likely a lure to encourage users to click on the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://dugedepap.ru/strik?utm_term=how+to+program+a+sony+universal+remote PDF link annotation
    • http://istlan.fun/59690614501iw0du.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/1405393.pdfIn PDF document text
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/5366856.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/wadabuji-dagurunel-vetajoxurag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492586/normal_5fc63cf5c0b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_6001cba84d6aa.pdfIn PDF document text
    • https://nagudunegotup.weebly.com/uploads/1/3/2/6/132681409/taludulonetizorumidi.pdfIn PDF document text
    • http://summerita.fun/624157426611kf8b.pdfIn PDF document text
    • http://4kuhd.me/cahier_des_charges_garderie_scolaire_tunisiexnm40.pdfIn PDF document text
    • https://buwolerujagelav.weebly.com/uploads/1/3/4/5/134580081/726c4ac7f.pdfIn PDF document text
    • https://purapunebofo.weebly.com/uploads/1/3/4/8/134888030/lefewupido_zulerelipalumof_zazemubi_veguzo.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/neduno.pdfIn PDF document text
    • https://detopeda.weebly.com/uploads/1/3/4/3/134305225/0c05948a3925b3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_fd9558e39f504c16ba8d49fb0ded264e.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_7a6178b2ece546d9ae5f38eb8a0d2709.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_182c99b07be4414483147247f9c156ef.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_cc556335e5e741c093ecf447a74c6d34.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1660caf16121484baee7b282fd3c7d21.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_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 5356 bytes
SHA-256: 61f68be074f17f47aba5627a1c8335b7da79a0dff31e479e11520d2a43023c91
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 10012 bytes
SHA-256: d5d5cd9bfbd4571136774788228a575f87b6944ce573195990a990945be648de

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