Malicious PDF — malware analysis report

Static analysis result for SHA-256 558954b8ea22a9c4…

MALICIOUS

PDF

79.0 KB Created: 2021-04-22 01:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 461caac1fc0a5dd46726df18fda0f817 SHA-1: dda3d0891dcaba733771e33a6058a879645f89c3 SHA-256: 558954b8ea22a9c46c71c906e038c21a389f2aaac8b2340dd1d7411a07f302b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_FAKE_CAPTCHA' indicates the document displays a fake CAPTCHA, a common lure to prompt user interaction. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://resalured.ru/strik?utm_term=a+christmas+carol+study+guide+answers
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/b86b043ee75793c.pdf
    • https://cdn.sqhk.co/pixanetu/fhjgdhc/93928629496.pdf
    • https://cdn-cms.f-static.net/uploads/4463812/normal_605554bec4060.pdf
    • https://cdn-cms.f-static.net/uploads/4454665/normal_606b6ef8f0ba1.pdf
    • https://static.s123-cdn-static.com/uploads/4390056/normal_60046aa608fc1.pdf
    • http://tivunuvuzamiguj.22web.org/47837242278.pdf
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/6470901.pdf
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/3751f59088d62da.pdf
    • https://cdn-cms.f-static.net/uploads/4373008/normal_6035c6f032320.pdf
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/9538016.pdf
    • https://cdn.sqhk.co/faxenukev/hpPgcij/word_cash_app.pdf
    • https://cdn.sqhk.co/sujubowip/Ufidjbx/redskins_color_rush_uniforms.pdf
    • https://cdn.sqhk.co/puxedimuwo/iYkbIgh/23577626777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pupudewasoxo.epizy.com/55931547386.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_0237146bf3b0401191c4e75ad17f0249.pdf?index=true
    • https://7fd4abad-31f8-4c52-ae8e-93d0cc7f2af2.filesusr.com/ugd/910e70_e05b64c2ae914006a9e084b9ff6024eb.pdf?index=true
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_62fc4893ae6e48e99255807e47a060fb.pdf?index=true
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_ad57f9d03c6341b7808924aee93d336f.pdf?index=true
    • http://nufufud.epizy.com/first_reported_case_of_multiple_sclerosis.pdf
    • https://s3.amazonaws.com/tofizo/bobaxaniwexiga.pdf
    • https://s3.amazonaws.com/devuxuzejozam/huskee_riding_lawn_mower_for_sale.pdf
    • http://xuvunemomot.epizy.com/troubleshooting_guide_for_blown_film_extrusion.pdf
    • http://mifisabewup.epizy.com/fotejafidazemoxabivovaw.pdf
    • https://s3.amazonaws.com/tikofaketonub/what_to_cook_in_my_new_air_fryer.pdf
    • https://s3.amazonaws.com/mefonevimimix/zikizetarobolimevud.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f731.bin
0b80ea8ce557f1b2163862fafb0afea98e0f84463886b17d70af909699cb08ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 5536 bytes
font_01_sfnt_off000109ee.bin
f1f17b5fa9a12fc4e0bacf902f1cae6606991903b79c07746bf852f653d0c44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 10724 bytes

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