Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d984e5012e80d8…

MALICIOUS

PDF

76.2 KB Created: 2021-06-04 16:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 43fd4f777efc1ce95ede747357a63038 SHA-1: 632c2c6dd6d4965c84e3a01fe7c1247e935c0679 SHA-256: 62d984e5012e80d86f54d23ac9243392768ca1a4012d30fad065b3acb86bcdb3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing lure, disguised as educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/pbw?utm_term=ejercicios+de+derivadas+logaritmicas+resueltos+paso+a+paso PDF link annotation
    • https://gefilatokakanor.weebly.com/uploads/1/3/7/5/137501249/wakeg.pdfIn PDF document text
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/9863610.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366664/normal_5fcb6ef8c7e08.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4371005/normal_60b2a88291890.pdfIn PDF document text
    • https://sudusomot.weebly.com/uploads/1/3/4/2/134265470/pawarojibiribodagum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_6008e4778fb75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_6003cdaf14c83.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/degarunadop.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369802/normal_60b54a37d5db0.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/roxipig.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/2826603.pdfIn PDF document text
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/861f0f8c2.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/596578.pdfIn PDF document text
    • https://reboxulowewo.weebly.com/uploads/1/3/1/4/131407709/0827c8a4ff.pdfIn PDF document text
    • https://webutukokixomuw.weebly.com/uploads/1/3/5/3/135317122/dinupumi-fogoj-kadomisoj.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421207/normal_60b354529ee18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381095/normal_6001162e8ec82.pdfIn PDF document text
    • https://kabigupux.weebly.com/uploads/1/3/4/4/134442156/zorib-kokopekeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_605a21d8d6a4d.pdfIn PDF document text
    • https://semumivotuwebaz.weebly.com/uploads/1/3/4/3/134379403/wonugoxizososidegera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe1c17b5cd14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felinemumivu.pbworks.com/f/sulonetodipugopunipag.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144423549/disisinelilugenagen.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/siwakumoboso.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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 5484 bytes
SHA-256: 4887427390a30ca64bffdd126fddc4f6f2a324896ebd09a0b2e455c237aa40d1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 12068 bytes
SHA-256: adad8f0fd969535c456634760afd3f208bdbf93d40342c911efc49f9d0a80b55

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