Malicious PDF — malware analysis report

Static analysis result for SHA-256 6464743822cc7e57…

MALICIOUS

PDF

71.5 KB Created: 2021-04-09 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bc24b0ca5d94b428e32cf81b1a37dacc SHA-1: 99c0c0f8d4cca1c2b7d7e0fbad29d505c0c747a2 SHA-256: 6464743822cc7e57795de9fa5ec2904dc9a4eb75fb94b0d4cb3c905adf20c4c3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious URL, 'https://gimoguvi.ru/strik?utm_term=how+to+enter+details+into+a+pdf', suggests a phishing attempt related to document details. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+enter+details+into+a+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366375/normal_6064b51e05528.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/YijfiiB/advanced_filter_sort_excel.pdfIn PDF document text
    • https://ranelelopo.weebly.com/uploads/1/3/1/3/131380755/1616423.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/neural_networks_and_deep_learning_basics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_60500a44dbdd3.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iiavieM/ringtones_for_android_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/gdPgjig/harry_potter_hogwarts_mystery_free_gems_no_verification.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/saks_5th_avenue_walt_whitman_mall.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/6856166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fef5eb9746f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widepidaba.atwebpages.com/petanil.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/ten_sports_live_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/afcat_2019_1_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/nokuzagefatofata.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/jojiwef.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/prysmian_spa_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/any_video_converter_free_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/bablet_cartoon_video.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 5088 bytes
SHA-256: bacf9e6fc738a7589b3695452fe0365f6999fade7d42a8c1f8931ac326197e84
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10652 bytes
SHA-256: fba2b0272de05b8f49ab43e745e1d9d009db6e724f6913e994f1fee32c9b46d4

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