Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5b769c325a8245…

MALICIOUS

PDF

74.3 KB Created: 2021-05-28 01:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: a09d0b0a53ad8f90d40d35f0221b1e62 SHA-1: 30e4f90a3cab5e87dd8f6e1d9906aa66b703324d SHA-256: 2d5b769c325a82451f8f3f37fdb64befa6dff83b51368a5c29924db88aa5d203
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL appearing to be a search result for router password reset information. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely used to distribute further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=asus%20router%20reset%20admin%20password PDF link annotation
    • https://mozejoli.weebly.com/uploads/1/3/4/8/134864480/xufikoduganumurabas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fc9299a2da65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603ffc2a5bf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd1b4c8cde6b.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/fonotovebapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_601de9dd931c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_60134b9e985f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fcfb6faec7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5ff852f9d2ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601e644335997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5fff27a6a1285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_60359443ed3eb.pdfIn PDF document text
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/3877965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fe7e636906d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_604fc6f644258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5feea936ebfc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_603c5b78e6496.pdfIn PDF document text
    • https://gogidexiveje.weebly.com/uploads/1/3/4/7/134762038/wabubak-kuxipirabikes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b6bc94-07d8-4d7b-bb1a-2f02a794ae58/fuvubodiludufaxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d832877-c948-4df0-b429-f04cb8ccf90d/wavaromoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45e0044-e204-4f4c-9441-d5938e548f50/how_to_improve_sign_language_skills.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5152 bytes
SHA-256: 9916425861bba9de76c707e192c601481b33757fb40a8f7f36f94cc7dd97e5d7
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 10616 bytes
SHA-256: c7e859513ae989805460e42bf04fdd30bc57758be9f4347c232cb5193e8e4fb8

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