Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3af45112d5e7af…

MALICIOUS

PDF

82.8 KB Created: 2021-04-07 15:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a18df7a6b2b7984a5b26ba31d6b4f3 SHA-1: 587dbacd3f03fbf00faf8302b47c68a2cf77c04d SHA-256: 7b3af45112d5e7af7106c7a22dd0aea53c0a7680359f6618ab255ca36eb8ad4e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, with ClamAV identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/123?utm_term=14+gauge+thickness+sheet+metal
    • http://jobs-ingenieur.best/how_to_strengthen_shoulders_with_resistance_bandsxtn51.pdf
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/garodal.pdf
    • https://liwarelavoz.weebly.com/uploads/1/3/5/3/135398493/372c3ca486bbb9f.pdf
    • http://reactivaperu-viabcpi.com/dell_inspiron_620_intel_hd_graphics_drivernbiof.pdf
    • http://plsale.pro/what_is_an_abc_poem_examplea08pn.pdf
    • http://kikifikoxije.mypressonline.com/javascript_tutorial_download.pdf
    • https://zuligaxexepe.weebly.com/uploads/1/3/0/7/130775912/fetogaxedok.pdf
    • http://ketenimolupev.sportsontheweb.net/89075327947.pdf
    • http://judupebe.getenjoyment.net/1966_cessna_150_poh.pdf
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/vitixananu.pdf
    • http://nakozek.mypressonline.com/dexibuwomoxaxosel.pdf
    • http://vaxenovutejuzid.sportsontheweb.net/ayyappa_songs_book_in_telugu.pdf
    • http://jofifuneku.medianewsonline.com/algorithms_for_optimization_the_mit_press.pdf
    • https://fikuwigo.weebly.com/uploads/1/3/1/0/131071253/f94753a220.pdf
    • https://jizetexosobuwek.weebly.com/uploads/1/3/0/7/130740437/kawotezifofeledila.pdf
    • http://tronreserve.online/area_of_shaded_and_unshaded_regions_worksheetn6vbo.pdf
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/satifa.pdf
    • http://urro-hu.com/neon_snake_print_bodycon_dress8o2tm.pdf
    • http://ritixibetono.mygamesonline.org/zofomaxufedemaxulojedub.pdf
    • https://panofokolonap.weebly.com/uploads/1/3/4/4/134483377/4967564.pdf
    • http://klyshsheff.xyz/87496109751vvohm.pdf
    • http://svarka-aurora.online/pefafaxumiligog1ak97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zubiluwetij.myartsonline.com/digitech_jamman_express_power_supply.pdf
    • http://temolujipu.myartsonline.com/zobumisidenixoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb44.bin
5575fbba1e32d80364411d3e4c3be026bcfbd43b1dee597ecca4d94c34c4e6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 4996 bytes
font_01_sfnt_off00010c1e.bin
9ac4bb44fb7298e0b556885b6df7b10b9e8fc3e05c86fb39ac548d225a42c379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10372 bytes
font_02_sfnt_off00012fa9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA9 4324 bytes

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