Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6200ca5cad43fe0…

MALICIOUS

PDF

69.8 KB Created: 2021-02-11 21:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5ab40cca736e400095bc14be6b68d17 SHA-1: 1538ed6694a0a57fcadcb2097c50565c1d4ec20f SHA-256: a6200ca5cad43fe0124fb79b5a7d06dc66b78541ec13284f62916113ba3b4f7b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=phrasal+verbs+pdf+by+vishal+sir In PDF document text
    • http://giveaway2020.info/wabumitanubahru9g.pdfIn PDF document text
    • http://com-signto2.xyz/calligraphy_letter_template719hy.pdfIn PDF document text
    • http://netzamka.ru/new_mombasa_policel5k9i.pdfIn PDF document text
    • http://selectgetc.top/nursing_code_of_conductpnbpc.pdfIn PDF document text
    • http://mon-cmbretagne.com/44381948670wnvv1.pdfIn PDF document text
    • http://pagebake.com/offline_video_downloader_free044o2.pdfIn PDF document text
    • http://tovarzone.ru/7700881638301gp3.pdfIn PDF document text
    • http://ezfix.asia/54977248992pbewv.pdfIn PDF document text
    • http://liolika-rsya.ru/garesedivuderjti6g.pdfIn PDF document text
    • http://pagixuzipalopa.iblogger.org/bootcamp_drivers_without_usb.pdfIn PDF document text
    • http://fijixedi.22web.org/47778309737.pdfIn PDF document text
    • http://netzamka.ru/danowenokebjn.pdfIn PDF document text
    • http://hookup750.website/20271681484n3dad.pdfIn PDF document text
    • http://reabook.online/7296707411212nv5.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/lux_meter_calibration_certificatexc6xv.pdfIn PDF document text
    • http://hookup668.site/chiari_malformation_in_older_adultsyx8c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gonefuxirazu.rf.gd/lowuwubutobupatisag.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/6900491008.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/58205982440.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/52984289126.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/41093625230.pdfIn PDF document text
    • http://jinixoxugud.rf.gd/translate_portuguese_to_english_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 5432 bytes
SHA-256: 3f7ace4ddf5ed7a93f58f4bdf8b7c4649d22cdafe06c970b3eedd629b03117f0
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 10640 bytes
SHA-256: 7440cef4e690bed4b9a43f333c9ad8d8395efecb8fe313c43d9001ed503efd99

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