Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b69ee088a2c083f…

MALICIOUS

PDF

74.5 KB Created: 2021-02-19 16:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 415fa5d3014613d1ad832546f9b3bc10 SHA-1: 27b9e0d3ccbfbd2053fa78d8696fb7d73a707564 SHA-256: 6b69ee088a2c083f266179d4487677d7f6988a27956475cf7a1b4394a3bb4c8f
184 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, with critical heuristics indicating it links to known malicious redirector infrastructure and a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the sheer volume and nature of the URLs suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wb?keyword=paternayan%20persian%20wool%20color%20chart In PDF document text
    • http://copyrighthelp.info/vafazufululoxafogibaro7f0oj.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/XhilEib/messages_wishes_sms_collection_apk.pdfIn PDF document text
    • http://itprod.space/avadhuta_gita_in_gujarati4rqjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_6003b246398fb.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/f1gfijj/how_to_pay_fastrak_ticket_online.pdfIn PDF document text
    • http://itasda.online/nejiladusiz5yqrq.pdfIn PDF document text
    • http://fridgeservice.ru/89413460124vnm55.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/fiahgKK/fuxobenututawaporekewuk.pdfIn PDF document text
    • http://giftcard-sale.store/95542339865yecg8.pdfIn PDF document text
    • https://niberijiv.weebly.com/uploads/1/3/4/0/134017170/34cf96ea6e605d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60245f6f9b2fa.pdfIn PDF document text
    • http://brumbum2.xyz/rerojowow61rsg.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/magapeguwabe/electricite_de_france_sa_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/90842501402.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/2010_camaro_ss_rs_headlight_bulb.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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 5216 bytes
SHA-256: 6a6ecd733862f420eb574acde08adc2117ef09ab416343c8d044ec6fe1e4b3e8
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 11248 bytes
SHA-256: f4a4dd5b1e631dc4047c0a5592319879fae6117dc08670b123a7b6bf294d5edd

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