Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2420ef78171c87d…

MALICIOUS

PDF

92.5 KB Created: 2021-03-02 21:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9346c639fedaa50f7b9f60ea004ef4d4 SHA-1: e27030a75b908da484920229162f85ac63440bca SHA-256: f2420ef78171c87d541a34baeb839372d641c03e1ffbff0a66d29871b10642b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+to+train+your+dragon+2+transcript+wiki PDF link annotation
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/nufujudeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_603159f6a48b5.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/nXhepje/54125714952.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/ihCujdp/opera_mini_browser_beta_old_version.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/vosisopegavip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_60152e77504aa.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/vuraradaso/free_video_er_freemake.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/77952603113.pdfIn PDF document text
    • http://pusolegulijased.rf.gd/gubopoxitizesidoxaleg.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/valogujazatumawajowazow.pdfIn PDF document text
    • http://sojizodujibibo.epizy.com/63510094282.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/dixipajetoratuzekaguru.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/berliner_platz_1_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/42882660795.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_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 5560 bytes
SHA-256: 0b4df43fc8321de13c5db8e531c4b736de2daef64b3987cd79ff85b9ed430d95
font_01_sfnt_off00013c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8B 12008 bytes
SHA-256: 9531fe8aef4221372eeb920914aa69507a31143e30f845fe1a49067d6550a5af

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