Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30df2e89733d642…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 08:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2b30103fb930ace32ecc0875dcb0614 SHA-1: b1fecb0373204f3f5c26c255398bcbcab8f4866a SHA-256: e30df2e89733d64225e7a0ef2df76125fd5b48a7734eea80d9cfca7e16a9261b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=king+of+wasteland+mod+apk+download PDF link annotation
    • http://www.almansori-ye.com/almansorifiles/files/35624236244.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/budajuxefe.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/68864988239.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/loxusazufoguluka.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mit5g7fqlq61egvf04t2vnluvh/pinasosu.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/18b2222ebb46bac246e54dda99dc8595/gaworobagebagebagan.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/44208606467.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/ketujozakedunuvagiwuzad.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/57506957952.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/kibazisarurozimatufuvagaz.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/mixotesiwomiziba.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/85662316287.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mepejavube.pdfIn PDF document text
    • http://bptramptour.pl/files/file/74500887746.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/63972432698.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/tulowurise.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/14608588839.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_1148_947.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2219366475.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/79088723803.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/69645367543.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/14271443045.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/67775866735.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bezewukikep.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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 16528 bytes
SHA-256: 545c67c98ff93ad9a308bf8dc59815f4eb142e78b2eba94cf014af80db7d2c28
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10912 bytes
SHA-256: 553b6e9ed9cd6be9726ea83c8171a885e3ca6dece99ff8383ed36e921fca6a99