Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5715de2d75c9780…

MALICIOUS

PDF

71.0 KB Created: 2021-01-14 22:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 38a6ba02a051cd48cbeef5394280e182 SHA-1: df0dfcec28457bee9a94c7eff3692a18d54e6321 SHA-256: a5715de2d75c9780d2f3faae558575b53d816153a6658b08be4f874caba52843
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link and a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Beanie babies'. The primary attack pattern involves directing users to malicious infrastructure via embedded links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffmen.ru/aws?utm_term=beanie+babies+hang+tag+guide In PDF document text
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/xidodexal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fa67b2a988b4.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/xovedurapitosok_fazixonejupoz.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hahchez/cartoon_sound_effects_wiki.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/sebebo.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/pisik/77725221409.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/xizafeza.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/nojawapeg.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/98860873699.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/saxon_math_answers_algebra_2.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_off0000d70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70E 5148 bytes
SHA-256: 5146c2ce76c34f4539450ac242d94d78be4a6fd8e8de43b345065bc382f08abf
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11788 bytes
SHA-256: dc80628a780f1577c08a8c2237e155706324962a83aa0cdeb4ec5d05788216c1

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