Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc97c67fcc6f9f…

MALICIOUS

PDF

65.5 KB Created: 2021-02-18 19:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 083be6b3dbcaa4fa24e8f6a083ffab98 SHA-1: 189e8a5a2d7b28dc9deac7ea606f410ea647f755 SHA-256: 73fc97c67fcc6f9fbefc397edcbd32454e2cfe35fcec7395c0795626d30882bd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO-based link farms and phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, with the primary one pointing to a suspicious domain. ClamAV detection and ML classification confirm the malicious nature, identifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm suggest an intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/wix?keyword=regal+cinemas+manassas+hours PDF link annotation
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/5608679.pdfIn PDF document text
    • http://reduslim-shopofficial.site/toefl_book_freet1vfb.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/ifhciiZ/how_to_fix_game_center_ios_14.pdfIn PDF document text
    • https://sidatotivokusud.weebly.com/uploads/1/3/5/9/135959985/dafuxedejizaguv.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/WKjgdge/cake_recipe_book_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/Zqchb5I/broken_sword_5_episode_2_trophy_guide.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/6996454.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/UMk3vw7/tozimajuwezoraga.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/pilagi.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/tibitexil/current_issues_in_the_philippines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/xupulesu.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/mac_catalina_iso.pdfIn PDF document text
    • http://bawibas.rf.gd/nesele.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/maintaining_meaningful_use_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/64993038428.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/foluxet.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/vigujezerupuzigajorelug.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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 5220 bytes
SHA-256: 35e1099c17ac5cae342698c733667177d95fd800d65f4f7d3b54f752ae98e3e2
font_01_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10256 bytes
SHA-256: a7268f5170ca1a331cae5057a9bc7553b3bec9312ba4379783482565bb2ff3af

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