Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bf8484ad2cc179…

MALICIOUS

PDF

90.0 KB Created: 2021-03-09 13:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756595546ade93e98a93a3c70258f60c SHA-1: 4ea04adbb49f3b9939d0a1ac723cf0b712ead56c SHA-256: a6bf8484ad2cc1794f8d8d1b2b97eec1a23594e92dc4fb8664103a6f6f8cafc9
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 are hosted on suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL and the document body's deceptive content point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/aws?utm_term=how+do+you+reset+a+sharp+microwave
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/ad173b.pdf
    • http://ehaberdevlet.com/geometra_y_trigonometra_pearson_unitec6i6ww.pdf
    • http://helpcenterbusiness.xyz/mogawudokivamijjm071.pdf
    • https://cdn-cms.f-static.net/uploads/4384828/normal_6033a86e3bcb9.pdf
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/modararilebed.pdf
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/795350.pdf
    • http://verification-help.business/93933416066o4mof.pdf
    • http://moneyindia.site/how_to_dye_hair_with_tissue_paperh6plz.pdf
    • http://vehicleusains.com/44306939928iv60v.pdf
    • http://lotsmen.com/rikobosorejifafuwonosulozcd1v2.pdf
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffd419836bef.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/9349609.pdf
    • https://cdn-cms.f-static.net/uploads/4483345/normal_5fe70f0346a05.pdf
    • http://giveaway2020.info/catavento_uniformes_uberlndia_mgafuvf.pdf
    • http://redtea.space/67399366944nt9dy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jarirotexab/anjathe_movie_songs_starmusiq.pdf
    • https://s3.amazonaws.com/zobuwubedak/46868213755.pdf
    • https://s3.amazonaws.com/zarusegibitumet/84995836089.pdf
    • https://s3.amazonaws.com/sefipa/nowefugeko.pdf
    • https://s3.amazonaws.com/somisilegex/esv_thinline_bible_natural_leather_brown.pdf
    • https://s3.amazonaws.com/vexeliku/lymphocytic_colitis_guidelines.pdf
    • https://s3.amazonaws.com/fedufiporara/android_9._1_p20_pro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b4.bin
02acb77db23a572c06c78f023b0e7ff58712445835f5aa9c4787e9c378d642a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 5496 bytes
font_01_sfnt_off00013457.bin
0b602e49e20fbe56866a798163a33a534f2ddb4d7c1af45de0ff0279d5e3257e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 11056 bytes

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