Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55090c2b23dfbce…

MALICIOUS

PDF

80.9 KB Created: 2021-02-21 09:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ae71effa771663013aec44f15012933 SHA-1: 9f7bc485c749afad775a57277a520d3d6b0a6b10 SHA-256: d55090c2b23dfbcef02ae0640deae5cb25080a8bf75cffc1a993d76327c6519d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://crophysi.ru/wix?keyword=pes+2018+mod+apk+unlimited+money+download+android+1 PDF link annotation
    • http://xosuxifareg.22web.org/52796050155.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/5914610.pdfIn PDF document text
    • http://construt.site/67554474179nqa34.pdfIn PDF document text
    • https://jolexufawiro.weebly.com/uploads/1/3/4/5/134595506/13c85.pdfIn PDF document text
    • http://razvivatel.blog/bbc_english_literary_companion_for_class_129ih1c.pdfIn PDF document text
    • http://chaptejvxz.fun/66127592353jzdkn.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/pigom_gipelo.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/busefuja.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/kuropo.pdfIn PDF document text
    • http://rizovog.iblogger.org/soxupuze.pdfIn PDF document text
    • https://rudarizegofuk.weebly.com/uploads/1/3/4/3/134355262/657424.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/8237952.pdfIn PDF document text
    • http://creditreportfast.info/din_sko_storleksguide_barnsuew9.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/kizadi_xodat_potisow_dekivudosudumag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvufewitopemaw.rf.gd/togoxirozama.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/gixaxujepiduferilonuzu.pdfIn PDF document text
    • http://moxutomib.rf.gd/53340379686.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/asus_android_driver_for_pc.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_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5884 bytes
SHA-256: b86947126ce3cf0ae6c622875a43c0e79d8d760e62514a2be7556c6240e615bc
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 10376 bytes
SHA-256: f1de59c2a212aa83a062487d20cfc937fc6b4f9c04851572c095eceaa9adf044

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