Malicious PDF — malware analysis report

Static analysis result for SHA-256 493dc516f5d7267a…

MALICIOUS

PDF

70.6 KB Created: 2021-02-15 11:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 01a38f1d463f587b0f13d30316d1210a SHA-1: b4ae00e9d7ce14f4e3ac3a608d8bc04ac755c3fe SHA-256: 493dc516f5d7267ab197a932e7652dacd8f73333ca5bfe7c04bea74417a20275
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/123?utm_term=linear+algebra+friedberg+pdf'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=linear+algebra+friedberg+pdf In PDF document text
    • https://cdn.sqhk.co/livisade/CicM2je/koguduwefed.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/5vZvT1z/the_world_ends_with_you_ds_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/igfggia/amazon_tablets_app_store.pdfIn PDF document text
    • http://dopenukivo.22web.org/56507789163.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/jcgcoVR/xupifewexaraxewokabu.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/jujadodedaruxix/34326405648.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/43035288727.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/fatapu.pdfIn PDF document text
    • http://judixipe.epizy.com/starry_night_mamamoo_mp4.pdfIn PDF document text
    • http://rewoponoxeki.rf.gd/86059782.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/report_of_the_adaptation_fund_board.pdfIn PDF document text
    • http://rakimeramut.epizy.com/lujotozazasiwolu.pdfIn PDF document text
    • http://gazinopalevigem.rf.gd/kodufixizulifi.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/lovoj.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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 4712 bytes
SHA-256: 9af124f52b2b4997182d8f75fb2679768e690fee7d2294ec104571bf34ce77ed
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 10188 bytes
SHA-256: 9dba4ec8b7a8ce4b6a718bf63036239acfd2aef61886d87d9f0b356d91055e99
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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