Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f25aeb88371d1f…

MALICIOUS

PDF

80.4 KB Created: 2021-02-19 10:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9339101f4ba97bcc30a57e04aa845ec2 SHA-1: 9faba513f16fc6916bce070153bf9457f3e84be8 SHA-256: 67f25aeb88371d1fa9455a6130a1a88afd41edc3aba87f8c0f23969f35885cfd
214 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the presence of a large number of external PDF links and a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content. No scripts were extracted, but the document's structure and embedded URLs point towards a malicious redirection or content hosting scheme.

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
  • 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://yafferge.ru/strik?utm_term=ode+to+aphrodite+sappho+greek In PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffdc84e71dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5ff51b843a4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_600e84104da25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fd8f06f18c8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff9039dd4e04.pdfIn PDF document text
    • https://gajerekore.weebly.com/uploads/1/3/5/3/135327587/pozelurawupogawu.pdfIn PDF document text
    • https://memekofonaw.weebly.com/uploads/1/3/6/0/136054412/zizaxewerijolim_mumesurilefegul_wudazozurugosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_602aea1211a68.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/1059526.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/salade/birthday_cake_images_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/vurebigututofewenobixiril.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/selective_breeding_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/crumple_zone_experiment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/comcast_mobile_app.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_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 5280 bytes
SHA-256: 368ad226d46c7029767f101649e02900e1fd55cec2ff8e2428f4b9f474016ad6
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 14572 bytes
SHA-256: 413d05a6ef1b986777a10dd4d0c65e542719e6b9d6acbe5af7d333435edd110d

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