Malicious PDF — malware analysis report

Static analysis result for SHA-256 62857d94a995d3ec…

MALICIOUS

PDF

91.0 KB Created: 2021-03-23 00:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd33e038d8d995a2e6ec51796dd9ce87 SHA-1: 97a3d312fe428fa7e4ff39a5db33df1607834450 SHA-256: 62857d94a995d3ec5b9666ea91082c408b01ebfe427408ad870205c4baaec00e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting an SEO spam or link farm tactic. One of the primary external links is to 'https://jacksth.ru/wix?keyword=ippon+seoi+nage+gif', indicating a potential lure for users searching for related content. No scripts were extracted, but the PDF structure and numerous external links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=ippon+seoi+nage+gif
    • https://cdn-cms.f-static.net/uploads/4472198/normal_605913b8318cb.pdf
    • http://neridofufuleteg.scienceontheweb.net/daniel_brailovsky_libros.pdf
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/jelufojem.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/7148218.pdf
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/watoj.pdf
    • https://gobujapupi.weebly.com/uploads/1/3/4/7/134725152/vupeme.pdf
    • https://cdn-cms.f-static.net/uploads/4476010/normal_6026d5b952b78.pdf
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/jogofarisofexak.pdf
    • https://luvemolovod.weebly.com/uploads/1/3/4/3/134305721/8da85.pdf
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/7dd6de529c57.pdf
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/5688910.pdf
    • http://juvizex.sportsontheweb.net/pugejafetifafepevugebuzov.pdf
    • https://static.s123-cdn-static.com/uploads/4384649/normal_5fc5eb388a85c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a342467-7801-4cfb-a006-5c16f0e0a309/how_long_to_cook_whole_chicken_in_air_fryer_rotisserie.pdf
    • https://uploads.strikinglycdn.com/files/e300830f-2523-401f-830f-43e23f7cca7c/nitapetuzawafugasoxexot.pdf
    • https://uploads.strikinglycdn.com/files/d25f8b6e-62ee-45ca-8a9e-7b0860711701/poetry_for_dummies_amazon.pdf
    • https://uploads.strikinglycdn.com/files/f7c1b453-7d66-41a2-9c03-152b59fd78a6/78400937761.pdf
    • https://uploads.strikinglycdn.com/files/5df90f60-486e-46a7-b489-d74867c99154/ford_3000_tractor_for_sale_australia.pdf
    • https://uploads.strikinglycdn.com/files/a2220891-f27f-4e47-9ad7-85b49046f963/what_are_the_three_types_of_literary_conflict.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e459.bin
3ddaf29acb43524c94cea50590210abbd3f8d4e033176d1191897177d29db38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 6296 bytes
font_01_sfnt_off0000f99c.bin
a524f4d9bbc46d5f8902218fc4b8a68e8daded203e2ec80689b13268af6f246f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 4876 bytes
font_02_sfnt_off00010a54.bin
22afd8dec45ed8423a58c40f4bada47b179c8ea7cf91bb52abc4a134263852d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16384 bytes
font_03_sfnt_off00013c3c.bin
b547648eef87add85567c6dc8a3799d7c976106f2088c28f61a15075acae52f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 19128 bytes

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