Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e66c8f0b192384…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 12:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca7869c85f850eedb8e49a9b0d2ea55e SHA-1: bf9d8f095aff1b3fcf15b32b2e93360927744efc SHA-256: 53e66c8f0b192384345b37db148b764abb80a92175b03e9fc9b81a4a16fcf336
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://huntic.ru/uplcv?utm_term=wps+wpa+tester+for+android PDF link annotation
    • http://starinviter.com/ckimagefiles/70314287024.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/fulavamuduwojonuxabixomu.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/79891769384.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/tovewizasuloxiba.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pupuposavat.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/18963831563.pdfIn PDF document text
    • http://rld-carbon.ru/file/navexot.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jutekuruzafawa.pdfIn PDF document text
    • http://rc-modeller.se/images/file///2754596251.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/86566911073.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/11638597116.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/pesapubevebaw.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/doratumaninebunoj.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/32729305276.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/89455964826.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_03_08_34_07_5977.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/55211890480.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xarotavanekip.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc07c5b13---60586831922.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/turugegi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/86338496548.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-11/20210911004358940486.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/94760435729.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/45152449669.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109151421188457.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://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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 10524 bytes
SHA-256: 40a103b3ab5e836a1416c56aaa5ae6f3cb316c41d9e2b8aebd57a885c4d2aef2
font_02_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 18692 bytes
SHA-256: a0ceea80e1119ddbb00d69724109fee6e55c2b0826413cc8b289cd234603916e

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