Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa45e5096cbf82b…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 21:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb056200d5f85579b8d6bb178f9a7f9 SHA-1: 0a3e116214b29f907e9b2255efbc59185acfd38d SHA-256: 9fa45e5096cbf82b922939ddecb29c2a58e81ff55a384d4270baa3f7dc9df781
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for directing users to malicious sites. Numerous embedded URLs were found, suggesting a link farm or redirection mechanism to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://emke.hu/uploads/ckfinder/userfiles/files/7026334045.pdf In PDF document text
    • http://wu-pao.com/upfiles/editor/files/86733940352.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/3540024597.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/75749909011.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/93818142963.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/61787379380.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vijebiwerunavopipigodigag.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/87284315179.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/roviputobimeguditu.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/lonufoxokenivafuluxiz.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/4852172635.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/tukasiguzasijujirup.pdfIn PDF document text
    • https://eguiders.com/uploads/wukimadaxanoj.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gamotunodaluvu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/59622659662.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/80163115028.pdfIn PDF document text
    • https://susta.vn/userfiles/file/ziwaden.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8619914fdde421d20e11d58423f91790/wanuruxaduparomabavuj.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/80499229381.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xutazomekirutijifogekuzup.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/luseborimunatekiludiw.pdfIn PDF document text
    • https://peterdegendt.be/file/22831466927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=isaac+rebirth+tarot+cardsPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/31865531161.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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 14316 bytes
SHA-256: 6133fab604d8d4026d62d0b3ad77739b579f220d8910237dd8c215bb688d7f35
font_01_sfnt_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10408 bytes
SHA-256: e9444a6e1021dd6114b6d7b29bbc12ac3bbc4bb0c79bbb11e9d6d30f1c5a2480