Malicious PDF — malware analysis report

Static analysis result for SHA-256 248e42858ee69808…

MALICIOUS

PDF

75.0 KB Created: 2021-02-15 20:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6d9552920978d634031bb5ef307e0c0 SHA-1: 58c4d9dc9767ad218c1fbe8f30095a78da9043c3 SHA-256: 248e42858ee698084765633100a69b7adab90d43615487894702de2ca475c7df
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. The document contains a large number of embedded URLs, many of which lead to external PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, but the extensive use of malicious URLs points towards a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=culturally+responsive+teaching+strategies+for+african+american+students In PDF document text
    • https://cdn.sqhk.co/woferomot/ifPjidT/60858842264.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/dHRUOiI/evolution_2020_las_vegas_bowl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_601330111c290.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/Fdyi5hh/escape_grandma_s_house_horror_game.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/jegeJig/3dlut_mobile_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/iSBhfjg/oppa_doll_premium_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/hhbienZ/vadetefewixunisale.pdfIn PDF document text
    • https://cdn.sqhk.co/sufadoma/M6tjjaB/86417715688.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/062d856d404ebf.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/iigghgN/norman_brown_just_between_us_mp3.pdfIn PDF document text
    • https://davufafelasipip.weebly.com/uploads/1/3/4/3/134328138/a9238ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 5636 bytes
SHA-256: 80eaa7269d1de51d70d7f73c825a557916d4bc23d857fc03a7138a195fec9883
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10732 bytes
SHA-256: d5a0ee6c9bf54900de71c7e8464f09ba716c4fbc0be788d12a8b15f3283b901d

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