Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a7be4ae0d556c0…

MALICIOUS

PDF

72.8 KB Created: 2020-12-03 03:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac75e521e0c1c66d1c73fffbbe1dbcb1 SHA-1: 7639a560fef04cb6ede958178a47573590211aee SHA-256: 17a7be4ae0d556c0794f4e01152e82c7dbbca6bbbf5eb08609e7cd7368fbf056
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its extensive use of embedded links, many of which point to known malicious redirectors or link farms. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content for link farms. The presence of numerous external PDF links, including one to a known malicious redirector, strongly indicates an attempt to funnel users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=stellaris+gene+modification+points
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdf
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5faadaa24cdca.pdf
    • https://jedudelovaki.weebly.com/uploads/1/3/4/7/134731231/2637af.pdf
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/zobusigilubawis.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5fab1a4379c9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizezobabub/aaron_sorkin_masterclass.pdf
    • https://static1.squarespace.com/static/5fc1c049c6d9645836281f45/t/5fc323cf4f98375720467c87/1606624208029/metals_nonmetals_and_metalloids_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/xurixado/agricultural_science_focus_textbook_grade_11.pdf
    • https://s3.amazonaws.com/mupukesunobaga/native_american_clothing.pdf
    • https://s3.amazonaws.com/vukusa/20334056571.pdf
    • https://s3.amazonaws.com/laradusa/zapake.pdf
    • https://s3.amazonaws.com/nigimul/60585642913.pdf
    • https://s3.amazonaws.com/xeponodij/26412060200.pdf
    • https://s3.amazonaws.com/kovilowab/math_mate_red_answer_key.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3a.bin
0fa22f71430cfe2195674fed2423ecc92ec54601f8a48c9fb3f0329f0f176fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 5580 bytes
font_01_sfnt_off0000f01c.bin
0c5d5e4ad28c54d74b49fd4d121ce362e5ed0cedf72993cc51b16c0067b4cb36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 11216 bytes

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