Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f16e45cef2b3008…

MALICIOUS

PDF

71.2 KB Created: 2021-05-24 02:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 99884b9abc3c3d1f0681a53bc4610521 SHA-1: b25eeb020adcbfbd99191d04e510a0bdfc70126c SHA-256: 4f16e45cef2b30084ea857978cced9154d737729c73666333b2e7aedabc00855
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=worksheet+on+angle+of+elevation+and+depression+pdf PDF link annotation
    • https://nunogekir.weebly.com/uploads/1/3/4/5/134597520/relaseludazukurowo.pdfIn PDF document text
    • https://wexewuvaxodewo.weebly.com/uploads/1/3/1/4/131407465/7914609.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/74845.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/kijobedekevodem.pdfIn PDF document text
    • https://pesulomerusetus.weebly.com/uploads/1/3/4/1/134109359/2730706.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/mezopaduzu.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/xowuxin-dalolez-zasekuvi.pdfIn PDF document text
    • https://nomukumimakolu.weebly.com/uploads/1/3/4/6/134649360/4bfd8ea5686.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/wutezigojuxi/castaway_full_movie_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c6e78f-b99c-4f68-9c32-ac0695911c00/symphonie_fantastique_2nd_movement_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/shakespeare_sonnet_18_bangla_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/5235734390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43a96a2-a2d4-4542-abb4-7e69b41ed1fa/85997715266.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/minn_kota_riptide_55_copilot_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3420730c-0c03-4739-a9b0-168116c06d6c/83517965029.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/vodozi.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/dotemimomizavijun.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/blaupunkt_40_inch_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/wifoxisozudofolezuxan.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/julius_caesar_act_3_scene_1_summary_short.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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5440 bytes
SHA-256: 07875920f8d0ee79a38a50b3d9b4f8f21a2593f0b4cbca5cce839c23b377180a
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 11168 bytes
SHA-256: 0dacc9eb8e7d1828d82353d9664f31764a138ead93c280051484ec31edeb791c

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