Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9053b989d15db71…

MALICIOUS

PDF

86.8 KB Created: 2021-03-20 18:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b26286995e3da71df4ef2fac8c71062d SHA-1: d974bb3af7e79062788d24b34a21bcf2c619126b SHA-256: c9053b989d15db71dc5f6d539f4c82d99970981bcff95d39b4891f15e5cad5fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the sheer volume of links suggests a coordinated effort to drive traffic to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=little+mermaid+cast+2020
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/9d4d1e91.pdf
    • http://bit7.top/55130113597wf9w1.pdf
    • https://ruxakidefo.weebly.com/uploads/1/3/4/1/134131713/kurepewakofifuvozud.pdf
    • https://larulukesulugu.weebly.com/uploads/1/3/4/3/134305666/waxigupofixunon.pdf
    • http://uablog.website/89383823443m6pjw.pdf
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/xejonule.pdf
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/c08f19b.pdf
    • http://reduslim-italiaufficiale.site/wezimabogor192.pdf
    • http://update-win20.online/how_was_the_new_imperialism_different_from_oldminlo.pdf
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/kivikisewoxupumat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jowawaba.atwebpages.com/how_to_write_a_letter_to_the_parole_board_for_my_boyfriend.pdf
    • http://rodisasedozax.myartsonline.com/the_triple_bottom_line_of_21st_century_business.pdf
    • http://gesorowar.rf.gd/fundi_bursary_application_form.pdf
    • http://valupakukav.myartsonline.com/vegan_meal_for_weight_loss.pdf
    • https://s3.amazonaws.com/wovugi/runedelig.pdf
    • http://xutenasejubibe.atwebpages.com/depilonikevozad.pdf
    • http://lufevexos.atwebpages.com/23779865721.pdf
    • https://s3.amazonaws.com/piradi/abhimaan_movie_songs_pk.pdf
    • http://rorolavosi.rf.gd/56645001705.pdf
    • http://jiroribi.epizy.com/1528277661.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000126c2.bin
ee820ea7a25f897046471ce9f31547e72c6e34296e9e8760af58236825d6b3dd		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x126C2 17240 bytes
font_00_sfnt_off0000ee4d.bin
c85d77d80535bab28edc5410e3f6b90c8949fa8bf479f773629b0c8d8d44ee3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 4872 bytes
font_01_sfnt_off0000fed0.bin
af1aab6411978e6e153573971b03fbf7ba9c527e8a48fd3c129b34686286288d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 11824 bytes
font_03_sfnt_off00013f8c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8C 4324 bytes

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