Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d2ee358c61f11d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-31 03:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b32bee84e76cec5d33fcdc5c83af4f55 SHA-1: c1667f5a2bfb07bccbf9fc2cf59287a18e6e1dc6 SHA-256: 54d2ee358c61f11d4f475e185fe74708d3bda096bb150d5c5534168429b80a37
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=wad+manager+1.7+freezes PDF link annotation
    • http://expressvpn.store/27982780364b01p9.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/learning_korean_worksheetse8gbn.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/c87d4949d.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/behind_the_neck_press_formtf043.pdfIn PDF document text
    • https://zijunuriv.weebly.com/uploads/1/3/4/8/134892089/pejodubemeg-juguvubo-fuvolidojumi-xitijewitimogir.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/f00f0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_604d405d304f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_5ff9ad6673cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6050fac24dddd.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/revibix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_602e34ef171fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_602b4f2eb1dd4.pdfIn PDF document text
    • http://francobusiness.com/jejezexr9e5z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/95413112807.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_59bcb5178e3646d0bb17be4f6d6a993d.pdf?index=trueIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_a9810378146042d98c0b4fece8d621c9.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_068891033d2a49f2aa579dc5d7b3e6dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liwafo/appium_android_testing_tutorial.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_e9f12c43419447b1bc43d9795bc861d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/duxodumekerugawojej.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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 5420 bytes
SHA-256: cb7e50b9b09bfee3b9312c5da88b1c546814c52b5fe9b855692ff100bc8f71d8
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 11060 bytes
SHA-256: a0e1e4e8787289e51e05d7026ab6f1f82b36b4d3e6017d70f12981dd11f5c371

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