Malicious PDF — malware analysis report

Static analysis result for SHA-256 b341733230018b9e…

MALICIOUS

PDF

72.3 KB Created: 2021-02-15 22:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2f003655db21c85b02a8b6d55ed7c9ee SHA-1: f48eb7fb6344509a55dd721d2241f9950193a202 SHA-256: b341733230018b9eec4464d01da7ebec8bd4a7c27da159dd8059eca7db515978
222 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The presence of numerous embedded URLs, some pointing to known malicious infrastructure, strongly suggests a phishing or malware distribution attempt. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=lasers+and+feelings In PDF document text
    • http://chaptejvxz.fun/tivordxnbl.pdfIn PDF document text
    • http://subfamjtii.site/biggan_chinta_20208c8iq.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/vujunikevidija-vaxaxebekenudoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fd272cd4b712.pdfIn PDF document text
    • http://endi-itali.space/strawberry_09_word_cookies_special_levelaaopq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600914fe01851.pdfIn PDF document text
    • http://unreguezff.rest/8297679948123k2o.pdfIn PDF document text
    • http://pl50off.info/goldschmidt_2019_abstract_templateuya05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_602aa6cb474a2.pdfIn PDF document text
    • http://belkwigs.com/gems_of_war_soul_farming_guideqecis.pdfIn PDF document text
    • http://wiinorama.website/social_dashboard_softwareng91l.pdfIn PDF document text
    • http://milky-rp.space/commando_2_full_movie_300mb8bn4y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_600d4b37d0c6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/kado_the_right_answer_opening_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/78163163755.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/short_english_stories_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/background_pictures_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/43995751173.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 5016 bytes
SHA-256: 1e19e4876981583468215e8acd98c1c942736fbd6f84c9c8bdd09347b93ca404
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10816 bytes
SHA-256: 18bcac5ef481b560ba23659e87ba8ba9aa7cc22ce7a09e545993e7cc7b60fd57

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