Malicious PDF — malware analysis report

Static analysis result for SHA-256 c969d88853c9847b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 05:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b9c8a5ca2d657489d59e42e1187bdd4 SHA-1: 47d7d0a3f8a3d9f4dc004699906ed6ed2e64042c SHA-256: c969d88853c9847be0c58c7033c9f5545d1dff527cfab7a56e0b717df8180991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially malicious content. The PDF structure and embedded links suggest it's used as a lure, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://glycocalyx.nl/userfiles/image/file/kalonifevugufal.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdfIn PDF document text
    • http://rjt1.org/upload/files/18773663778.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/rajunitegor.pdfIn PDF document text
    • http://philboyd.com/57336052310.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/31770666323.pdfIn PDF document text
    • http://clingac.com/d/files/71447994293.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/8687334170.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/33470532303.pdfIn PDF document text
    • http://hkacca.com/userfiles/sujotovoji.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/lopelofexeg.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/16299124937.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/12257224267.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/1651164087.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/mivari.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210907001117.pdfIn PDF document text
    • https://blugarden.eu/file/wufivexe.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/2159708270.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/jekuvimekose.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/megifopamejaniwopuno.pdfIn PDF document text
    • http://cabini.it/userfiles/files/13830815561.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/89529152498.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/19902372963.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910231520.pdfIn PDF document text
    • http://cycling-software.com/files/file/xozunonabapiroxosutabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=visual+c%23+tutorial+pdfPDF 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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16716 bytes
SHA-256: 05011d78dcd9c12b92e2432a3338737b765ade687fd47541dae9a02f496a0921
font_02_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 9736 bytes
SHA-256: 17c10bb8c3f7111c232cafcd38af3780c29d135ca992d11ce4d9ae0a9dbb1b97

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