Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b90815b2cf1bfb…

MALICIOUS

PDF

123.9 KB Created: 2021-03-15 08:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e765b4dc8615d953b32b68bfafcf5511 SHA-1: 0a6112685b02f21f34d4694aaad8850bd365fe45 SHA-256: d8b90815b2cf1bfbe71e7535f7d5e7f65e14c7488fc8ffbc8a61c260cf8b6400
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://yafferge.ru/123?utm_term=un+ipcc+report+2018+summary', are designed to lead users to potentially malicious sites. The presence of numerous external PDF links suggests a tactic to distribute or obscure malicious content. While no scripts were extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=un+ipcc+report+2018+summary In PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/vobujuvoge.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/hchciro/bubble_gum_simulator_codes_for_legendary_pets_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/hjjfPhb/30189459300.pdfIn PDF document text
    • https://cdn.sqhk.co/ferudati/CmQxicA/60921237930.pdfIn PDF document text
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/zububowowexuluw.pdfIn PDF document text
    • http://3203epworthcres.com/what_is_nationalism_in_historyeygul.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/eMibii3/62942305015.pdfIn PDF document text
    • https://cdn.sqhk.co/zevivovakok/q8m1idu/method_validation_protocol_template_free.pdfIn PDF document text
    • http://gelchlen.fun/wild_thing_guitar_tabk0rjr.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/bifokakaxu.pdfIn PDF document text
    • http://urro-hu.com/bubble_shooter_offline_games_free_downloadf3cwo.pdfIn PDF document text
    • https://xopigitit.weebly.com/uploads/1/3/4/3/134339451/4557915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c64d04-1dad-4500-a6d7-33b54e05d89b/when_you_wish_upon_a_star_piano_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee3c36-7567-4593-9813-83ee2ebca515/fundamental_analysis_of_stocks_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/kotara_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/af_quarterly_2001.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/sunomapuwefi.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/14596720597.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/a_news_report_on_an_accident.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/numpy_docstring_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/pathways_to_astronomy_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A438 5660 bytes
SHA-256: 03cd363846c9256dbd6ad46de98e5c9980d7df2aff0c4d2885f477cc5fe85aaa
font_01_sfnt_off0001b76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B76D 12468 bytes
SHA-256: 6f1a5fa7c368076bed98e61a1c1c10ddcb59f3f89021343a3a59f3a602920554

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