Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23be6365e016c18…

MALICIOUS

PDF

80.6 KB Created: 2021-06-10 06:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1351e2ca9a000ee4749ee0e73a2d0250 SHA-1: 0f153bc6900654dfd0e87c3bd48c08af98f1666a SHA-256: d23be6365e016c1815ca02b5af140a5add3796302f6696ee24192ca70b118eec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://archism.ru/pbw?utm_term=new+super+mario+bros+2+drastic+download', appears to be a lure for downloading a game, which is a common phishing or malware distribution technique. The ML classifier and ClamAV also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/pbw?utm_term=new+super+mario+bros+2+drastic+download
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/lemafalolewugis.pdf
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/9044727.pdf
    • https://cdn-cms.f-static.net/uploads/4372682/normal_602ac82d6d634.pdf
    • https://cdn-cms.f-static.net/uploads/4487618/normal_6046e98cc6ac2.pdf
    • https://cdn-cms.f-static.net/uploads/4470981/normal_606821383293d.pdf
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/tanojowebi.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/fodanuz-surixi-jejexujeso.pdf
    • https://cdn-cms.f-static.net/uploads/4445750/normal_60c1385a948c0.pdf
    • https://gegaminowudajun.weebly.com/uploads/1/3/4/0/134041134/8344469.pdf
    • https://static.s123-cdn-static.com/uploads/4472204/normal_5fcca8927459a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/441f7f28-66d9-454d-bc3c-916070c63e70/java_swing_toggle_button_color.pdf
    • http://wurutaw.pbworks.com/f/baby_alive_grows_up_walmart_mexico.pdf
    • http://zefuberiwuli.pbworks.com/w/file/fetch/144844986/freundlich_adsorption_isotherm_equation_at_high_pressure.pdf
    • http://sajutom.pbworks.com/w/file/fetch/144712287/2643592388.pdf
    • http://letonepamusi.pbworks.com/w/file/fetch/144648000/99789899503.pdf
    • https://uploads.strikinglycdn.com/files/d1503d2f-8155-4655-b897-73b68419fb9f/the_secret_life_of_walter_mitty_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/9d4c93e7-a056-4753-aefc-bb706baf1ded/casio_g-shock_dw9052-1b.pdf
    • https://uploads.strikinglycdn.com/files/f1bb2aee-8264-4990-b43f-72604e302be0/preterite_vs_imperfect_part_ii_quiz_1_answers.pdf
    • https://uploads.strikinglycdn.com/files/2333b2cc-ec43-4c0d-8376-5711b7cdffac/5957051584.pdf
    • https://uploads.strikinglycdn.com/files/6ea502b6-056c-42a0-8b97-3a5f43d2ed53/daveg.pdf
    • http://ruzudateteb.pbworks.com/f/the_power_of_vulnerability.pdf
    • https://uploads.strikinglycdn.com/files/d19261e2-85ef-4fcc-b29a-cff8160fca87/wd_my_cloud_home_4tb_plex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f4.bin
f403db744d9a327b1c7a1636ea2c55224ad1df4955652991587c9b1e6e112f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5552 bytes
font_01_sfnt_off0000f4c9.bin
a538a67ec3f5ac225b1b49f8f55b861fc0f4c26cbf1142ae84fcc0ab6ab514b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 13676 bytes
font_02_sfnt_off00011efb.bin
69a53bb3246fbfed9f11fc49183864827693e79a01c66a8ef50d4520ca37ac35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 16332 bytes

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