Malicious PDF — malware analysis report

Static analysis result for SHA-256 f624961757cede2a…

MALICIOUS

PDF

71.7 KB Created: 2021-02-19 14:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 09d652ef6d1646805cfc28a2c32bbb23 SHA-1: d57ccd4570eafee4f9339d5e70b12f17471dffc3 SHA-256: f624961757cede2a20b87557f41fca323db75d20baa8f4a04781c2a9ecab5d60
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least two identified as malicious redirectors or part of a link farm. The document body, though partially corrupted, suggests a lure related to 'Wenzel tent setup instructions', aiming to trick users into clicking these malicious links. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=wenzel+tent+setup+instructions In PDF document text
    • http://naturfresh.space/dovenonaxutebakataje9k1n6.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/nanopejudetiz.pdfIn PDF document text
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/821936.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/lobug.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/jaxakal.pdfIn PDF document text
    • http://roralukomoko.22web.org/1_inch_binder_spine_inserts_template.pdfIn PDF document text
    • http://cpatrump.com/batting_skills_in_cricketttfhr.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/ia5EMsj/lebara_mobile_internet_code.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/gezetega/vlc_player_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/55433411698.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/vpn_india_server_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/kaxobodimuzov.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 4780 bytes
SHA-256: bf76c74b77a92bba869f13e1ab367563b830f1010ba072897e6a3a872cdbb33a
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 11452 bytes
SHA-256: a10738803087a6e531b5545bcd2bea9792e86d41a68b46c9b2346806c8cd6572

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