Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41a8fe6e85d1753…

MALICIOUS

PDF

111.9 KB Created: 2021-05-28 22:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 296cd622d92cba5a2ef864351c457995 SHA-1: 4e517b6391bed497107adbb0a670f8d532ac3bd7 SHA-256: e41a8fe6e85d175388cb62526c147f8cd60c22a7393467b3195a697a3778e718
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits malicious characteristics, including a critical ML classification and ClamAV detection. It employs a recovery secret lure, attempting to trick users into revealing sensitive information. Furthermore, it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content, such as the 'snooperscope apk download' URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://midufefew.ru/strik?utm_term=snooperscope+apk+download+for+android PDF link annotation
    • https://nebegozanukasaz.weebly.com/uploads/1/3/4/6/134699913/2713657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388842/normal_5fedbb4e6d237.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/6079821.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/965a371e6c0166.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/fekijevokomekebura.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/ba337319d.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/7658947.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/konabo-dudabinifebaran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415929/normal_5ff5f98268593.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/mirusezirojanuf_netirixo_bawawexuwe_jumevoz.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/8920838.pdfIn PDF document text
    • https://dawofatodir.weebly.com/uploads/1/3/4/7/134756430/09ad0.pdfIn PDF document text
    • https://sapakuso.weebly.com/uploads/1/3/5/2/135297556/1352007.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/zupidunuxobezasofo.pdfIn PDF document text
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/xudamarif-nepefu-pimewu-segupa.pdfIn PDF document text
    • https://tatuxosigataban.weebly.com/uploads/1/3/4/7/134770737/6944371.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://uploads.strikinglycdn.com/files/7e52ba10-a8c1-4dd7-84e4-8bd7b36a3b9b/vubejigupunixivuzezubide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4262735-4f93-42ad-99b2-b716e963c8ee/podenubosagakoladowe.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_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 5116 bytes
SHA-256: 573fb618d800fd1b5f2b2ff965680328a0157737bec68e8ddf4649ef1b51fe98
font_01_sfnt_off00016834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16834 11296 bytes
SHA-256: cc4d82bc082c8f62f3bd09edc77c405374f5c2ec6daf702f6f8e506bca588aaf
font_02_sfnt_off00018ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE8 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
font_03_sfnt_off0001a3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3AF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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