Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d8674d3653c2c1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 20:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 98422d35d0edd5bdcc02143bd2f76639 SHA-1: c3630bf222411cae5dad1203247f05b4a8cc9bfa SHA-256: c2d8674d3653c2c154b4e01a16bacf566b366d13bd86aa0fb3b0e1755014c3f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous links pointing to PDF files, one of which is presented as a lure for a "video projector simulator apk download". This suggests a phishing or social engineering attack aimed at tricking users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thucancakoihikari.com/luutru/files/63078159701.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1d945o1t5rnu3bubm8o1e2jv/34003680335.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/larawimureke.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/75304932213.pdfIn PDF document text
    • http://kechengchem.com/upload/files/gijejolemuwowek.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/70090538758.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/fuzezuxewalekuv.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/46044337709.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/79972008652.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/88149816161.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c334094---vomobirewozogafovufu.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/77321113849.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59989496411.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/51960435403.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/3864227707.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/61602434482.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/91344634044.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/musaziligekiwetatuvere.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/63384700073.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/61683184132.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/73031500666.pdfIn PDF document text
    • https://birudongker.com/contents/files/kurir.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/10563389623.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/42816391420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=video+projector+simulator+apk+download+for+androidPDF link annotation
    • 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_off0000aecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 11156 bytes
SHA-256: 9b7a1ffd8876bd2e721456021daf93e6ba553ee9c2bbe8e58a7cab7ca613a803
font_02_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 15328 bytes
SHA-256: bcea9aad31e87c691c526a85c340118aaab5ede3b1b6b36393dc0dc8803f1f24