Malicious PDF — malware analysis report

Static analysis result for SHA-256 2704ccd5c38f1c34…

MALICIOUS

PDF

57.5 KB Created: 2020-11-25 08:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5cdb4739557522a964ffb9e4dea2adcc SHA-1: 6d9cbc660b14b01f5aef5b81a68494db4524443c SHA-256: 2704ccd5c38f1c34d3ca2904083e41da7d0cfbf63fb3720821f3309fb7118c78
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple links to external resources, including a known malicious redirector. The heuristic firings indicate it's designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cctraff.ru/123?utm_term=thomas+calculus+solutions+pdf+14th+edition In PDF document text
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/9294194d.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.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/mexijegedakol/goku_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/fomijubaxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/ipod_shuffle_2nd_gen_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/number_patterns_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/rufelopuzod.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/castlevania_game_boy_advance_rom.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_off0000a521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA521 5388 bytes
SHA-256: dba66f2b4fd6ae901a7a33bf3f0c573c9c0909fab268ca8f374a0f51aac20ee5
font_01_sfnt_off0000b75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75A 10128 bytes
SHA-256: 0e25f70780602c97cd39e61a9b13b9a0c22b17e2bd19defbc0179d8c3b866be0

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