Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a227e654ab0088…

MALICIOUS

PDF

84.7 KB Created: 2021-02-13 00:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8010171e529423907f89b33cda522321 SHA-1: 48fa112c035a5f372f398809ab4c9016dc80e0a8 SHA-256: f9a227e654ab00888feb42b08abe0cb3b9db399373a4a82be966ac6ca4b145bf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=w+clement+stone+books+pdf In PDF document text
    • https://gewilowada.weebly.com/uploads/1/3/0/7/130776716/1442744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fca658249247.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/isiflgh/zombie_city_defense_2_apk.pdfIn PDF document text
    • https://jewinovezuxumat.weebly.com/uploads/1/3/1/4/131407424/9123091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fee1337ac448.pdfIn PDF document text
    • https://vikabedegopeve.weebly.com/uploads/1/3/0/8/130874339/fovajupoxovame_ropox_pobuzakojos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasawe/adform_stt_tte.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/agama_car_launcher_full_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/7969993157.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/magic_eraser_sheets_review.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/89890908436.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/posavexipowofewapixalo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 4952 bytes
SHA-256: adf96b27c3c0d10f7cd402ea87632fba56fd631ef27e39dc5ca60611d71aa529
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 10400 bytes
SHA-256: 8cf25e272dec6c70925d1c406c4bbc71d2d643b685553630669d094d2cd33d57
font_02_sfnt_off000137c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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