Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d05024050256dd7…

MALICIOUS

PDF

82.4 KB Created: 2021-02-11 01:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b4f9535669a9c95911fe5577577435b1 SHA-1: 727316216992630a61676d6ba2faaf0504b66e97 SHA-256: 4d05024050256dd74a01c79e0eca44fa08d8b9511ef2de4b2a5960ca076c4dd4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The document body, though heavily obfuscated, suggests a theme related to sheet music, likely a pretext to drive traffic to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wb?keyword=gonna%20fly%20now%20sheet%20music PDF link annotation
    • https://ximepovefuvaxoj.weebly.com/uploads/1/3/1/8/131856443/1406777.pdfIn PDF document text
    • http://alex-travel.moscow/se_clatina_imparatiile_versuric89p4.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/8415612.pdfIn PDF document text
    • http://lisolu.org/43381551403thkoy.pdfIn PDF document text
    • https://bezujopejot.weebly.com/uploads/1/3/1/6/131606295/nekokutavoxaworuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_60100a62e1bff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_6000d7fc19032.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/vurelin.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/xutadufelijur-zakivewavokoton-gafifirutere-rapabalisos.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/insurgency_game_size.pdfIn PDF document text
    • http://boomua.site/offer_up_apk_2018b3kg9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_6019dd5c165f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dolasuwukino.epizy.com/rojuwopidarafavadefuniki.pdfIn PDF document text
    • http://muwadobekele.rf.gd/78554876937.pdfIn PDF document text
    • http://bezepegu.epizy.com/dengue_guidelines_sri_lanka_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5248 bytes
SHA-256: d255f6d51e2a8beaeb8619864568fac2c42016d79378c545957be27f9e6d2c06
font_01_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 10816 bytes
SHA-256: e4e05b7702947cb54925ee556e02fa30207e0f559bd9208f3ef85cfa78080c4a
font_02_sfnt_off00012759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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