Malicious PDF — malware analysis report

Static analysis result for SHA-256 a441ffb216b4f13d…

MALICIOUS

PDF

106.2 KB Created: 2021-04-06 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ae7b2fb83cb052c88f5efb3537a5a4e1 SHA-1: b8fd693c1d94b484a46c0724fe83fe429badebac SHA-256: a441ffb216b4f13d2426d983cff3431a5389313bc8c9cf92a5aa8fc997b24355
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=which+is+better+ariens+or+cub+cadet PDF link annotation
    • https://wivaralizufijol.weebly.com/uploads/1/3/1/4/131483386/8226050.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/assimilation_in_english_phonology.pdfIn PDF document text
    • https://gulojisaxedux.weebly.com/uploads/1/3/4/5/134598876/gixokonifijura_donalopixirobom_rekigumilaso.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/jedolizogimixabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445541/normal_5ff333585f850.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/betutubexojoj.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/pandas_select_row_by_index_column_by_name.pdfIn PDF document text
    • http://soinjaga.ru/what_is_emotional_labor_and_how_does_it_impact_employees6trbf.pdfIn PDF document text
    • http://bestita.space/android_ftp_client_github50okv.pdfIn PDF document text
    • http://muziwavesos.iblogger.org/werulumilevoma.pdfIn PDF document text
    • http://menformula.xyz/54540932136xqjtd.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/mulakiwebiz_ruvokod_padavezonibeja_xawinanipijuwu.pdfIn PDF document text
    • http://afterdealer.pro/lean_canvas_template50069.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/wamanelivubeg.pdfIn PDF document text
    • https://ginalanofogise.weebly.com/uploads/1/3/4/8/134886059/zopikumibid.pdfIn PDF document text
    • http://ch-redirect.icu/noxaxidukebusenoviv6gkd.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/f4d0ab731d40fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5fe3d63eb067d.pdfIn PDF document text
    • https://nedetufajazigaf.weebly.com/uploads/1/3/1/6/131606803/e58857b94.pdfIn PDF document text
    • https://venipasor.weebly.com/uploads/1/3/4/5/134584053/010f063b.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/38658472533.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/92d72764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wiwifiladovov.epizy.com/grade_4_math_word_problems_worksheet.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/xerevexidelalidutiw.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/sultanate_of_sulu.pdfIn PDF document text
    • http://jaxurulefer.epizy.com/gasoninamujalibulifosu.pdfIn PDF document text
    • http://reginujijuf.rf.gd/tufigezafe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A6 5032 bytes
SHA-256: 37fade95a03664d316eb90692f2fb2ef3e2aeae08f02de3f19d35621ab5fe051
font_01_sfnt_off000162b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B0 12432 bytes
SHA-256: d160028147aca94d024c57ba67af6e8a2ccaed92d4bacf30ecb39e2a76651b70
font_02_sfnt_off00018cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3