Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02d743776cccc5a…

MALICIOUS

PDF

71.2 KB Created: 2021-06-09 13:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 94e75d7e82918b6fc0de610f6cf04591 SHA-1: 55600d14fe12b31314e2a78192fca1ac3f5396b1 SHA-256: c02d743776cccc5a67615b25c53447467a7e36edb0c801312c2b4bd15a366469
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or phishing attempt, and is flagged by ClamAV as a phishing trojan. The document body, though obfuscated, contains a reference to 'Slendytubbies skin tinky winky', likely a lure to attract users to click on the embedded malicious URLs. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://coretry.ru/pbw?utm_term=slendytubbies+skin+tinky+winky PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5ff14413e1c43.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/nodisana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_603c52969ada2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_5fe233dd4e718.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/tikexiza.pdfIn PDF document text
    • https://zedaluridafam.weebly.com/uploads/1/3/4/4/134464222/rilutijesurutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5feea517270ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_60582503d515f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5feb7e9291dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_606dcc65301a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5ffc4e4b4c8a9.pdfIn PDF document text
    • https://tipiridevozono.weebly.com/uploads/1/3/4/3/134349557/bb121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_60563723056c1.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/2950890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fdd2ff8e8397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neruwuk.pbworks.com/f/noxegagere.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/w/file/fetch/144787437/how_to_make_music_bot_discord_android.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/jilunixare.pdfIn PDF document text
    • http://pikalunik.pbworks.com/w/file/fetch/144867891/49565173064.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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 5012 bytes
SHA-256: f40566d2db1ac0c81713e3686ecbd576529da072b9f9f058fd1929b63d6c1f89
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 11088 bytes
SHA-256: aa2c4c6eda78937fb6b2283faa9d9b9b5eac35e86cae89ba540767801aaaa6ac

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