Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c40fc8129f17f09…

MALICIOUS

PDF

71.0 KB Created: 2021-02-16 09:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e970adb7838eee67a640c1e539f92d1c SHA-1: a46c4346231e0f1a59e6c8bb8819e8297bd719ae SHA-256: 9c40fc8129f17f09ae57112785eeb60b8c1375a8e49f83001f88fb0c940c2c63
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting and are flagged as redirectors to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, malicious sites.

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
  • 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 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.
  • 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=ernest+hemingway+indian+camp+deutsch In PDF document text
    • http://instapriz.site/696697201155jxkd.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/bowojup.pdfIn PDF document text
    • http://jofijuke.22web.org/cactus_y_suculentas_nombres.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ffc7decc4e4a.pdfIn PDF document text
    • http://dalovujunaguk.22web.org/free_anti_bribery_and_corruption_policy_template.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/34607008838p0dwp.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/wopar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5feb25eb2fcb1.pdfIn PDF document text
    • http://help-business-media.com/wanepqoptk.pdfIn PDF document text
    • http://vnds-super.space/gorivewomagabubewugase0xddu.pdfIn PDF document text
    • https://wenudujajavu.weebly.com/uploads/1/3/5/3/135318124/kadejabenetileg.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/jefazaxal/anghami_app_store.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/9714714001.pdfIn PDF document text
    • http://tovajukoxeboder.epizy.com/vans_old_skool_platform_black.pdfIn PDF document text
    • http://kulivobelokogun.epizy.com/equations_worksheets_grade_8.pdfIn PDF document text
    • http://kopozeluzel.epizy.com/sojudadukimifinavimuson.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/75620101980.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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 5604 bytes
SHA-256: 5d64afe517de1f337b06927256497e0426a63bb12e08cb2628575c1a609160c4
font_01_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 10120 bytes
SHA-256: 148bcd5f37a17daffed1030c4ccbd935481082b17034965a943989f45814394e

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