Malicious PDF — malware analysis report

Static analysis result for SHA-256 faef4c437633b9c1…

MALICIOUS

PDF

77.2 KB Created: 2021-01-09 19:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a318ff00cc29ae334de2e3f1462bdff0 SHA-1: eeab6fbd58c66ecf920071853c281b31ab66aa0e SHA-256: faef4c437633b9c1d00e248ef680c2cdcfb1988f091ac9b375bef1305f3ca141
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=dbm+guidelines+on+bac+honoraria PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fcef57b38b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_5fd647ce04ce3.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/tachyon_vpn_apk.pdfIn PDF document text
    • https://kejopawilut.weebly.com/uploads/1/3/4/7/134709951/gamajiwev-gopodulate-mefezirusi.pdfIn PDF document text
    • https://site-1181732.mozfiles.com/files/1181732/15130473336.pdfIn PDF document text
    • https://sunanineriputa.weebly.com/uploads/1/3/2/7/132740954/8584715.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/loneminovu/4676430112.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/sozoja.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/vexosikelibotuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/future_indefinite_tense_worksheet.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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 5296 bytes
SHA-256: f601fa3f0f331502db3d5f5c373d15f7b548aa8571cf9bfaa8da27a2b9d4612c
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10944 bytes
SHA-256: e367f9fa5db9e63fbd8630b7258c5a1e42ef670af0b6a81ebca3c5b1194303fc
font_02_sfnt_off00011a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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