Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaaebe9c939c04d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 15:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2784ad51851ebeeaf030ce1d625ab638 SHA-1: 699509a0258054d24488801608d6608dfcff6a7f SHA-256: daaaebe9c939c04d4d572f7d3ea3e3642f71463d185763cb78a19a5005c71bed
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The document body is heavily obfuscated, suggesting an attempt to hide its malicious intent, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 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://kompaspt2.com/contents/files/lixijifigafuxoxudexug.pdf In PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/17008714525.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/3572478262.pdfIn PDF document text
    • https://kimcert.org/E/file/44947117119.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zurine.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bivorexugedel.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/wafokivixuvudiko.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/fanevitususebivojupenu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinivibejujexigifazixilu.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/40902417411.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/963502383.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/67367907700.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/74125580915.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/vegapaza.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/35029094784.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210905190752-29415210693.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/pemazezajujidubebomeniw.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021924054103307.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/76715929995.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109151733379064.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/41167821920.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/simalorinikewag.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/4494491876.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/vizubosufibogif.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109211233024104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=black+heart+emoji+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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 15432 bytes
SHA-256: 2b1d028428a9abbc55c9063cfd6f7c8fafb5e73fe7b4cd7ef9ca3f54ce22f0c5
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 10740 bytes
SHA-256: 620421d30dbe2b546dae1e3f5cee08459a4adce1595e15735354dc4515acab4c
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1