Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8a70645ed43a8e…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 09:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79b226d20f43e363e33b49189ba64e61 SHA-1: b8d7700ff88143b1f0ba9355b42b7e5f70bbe94d SHA-256: 1f8a70645ed43a8e3a066fdbdf481b6f6ca4fc63d79ca7c486e61b99cd1f2f5c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/strik?utm_term=how+can+i+record+music+at+home PDF link annotation
    • http://discount50.pro/tekin_rs_gen_1_manualh9fte.pdfIn PDF document text
    • http://ita-talia.fun/how_many_calories_should_i_eat_according_to_my_weight_and_height91a5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_600251eb3d06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_5fd9816000b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_602be49edc94f.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/sesijesule/assam_full_map.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_f1af81a57cca480c8085d606d6390935.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/ruwudewotipedigazaf.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_af0b2f9a72d541ae97a235e2bc9a4558.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/human_resource_management_seminar_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/collateral_management_agreement_template.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_a3bb8e01fed54563830ebc35af973f2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/the_bugs_bunny_road_runner_movie_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/21194592435.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/maxuwepukanebekorupop.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 5200 bytes
SHA-256: 89ac914ffbaa63849d33d869bbc0b9b82fea98db5e9f2f728cee3fbec2d577d2
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 11616 bytes
SHA-256: ec29f24a4eec3d7cc5c362504f94c39267c38350da92fef29c7b115cc144e47c
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17

Open this report in the interactive analyzer, or submit your own file for analysis.