Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ecb4e677b4323b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 14:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4faefee956ef4a2c2dfc403239f8209 SHA-1: e3ca5cea5ace0086267e9b54d12b6b07882f10f6 SHA-256: 88ecb4e677b4323bac97d1218cc177820e35f10bcdde6fc94a6394c4c4dfdaae
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links to external domains, some of which are algorithmically generated or hosted on disposable infrastructure. The heuristic 'PDF_IMAGE_LURE' suggests a common phishing tactic where a full-page screenshot hides a clickable element. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=high+graphics+games+for+android+mobile PDF link annotation
    • http://www.tsahimmongol.com/uploads/images/files/xikiwogakoxuwevugowob.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/79656515369.pdfIn PDF document text
    • http://calisnt.com/uploads/files/guburezone.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45992259115.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/sinewud.pdfIn PDF document text
    • http://foodchemsino.com/d/files/44777813016.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/1986939103.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/nubezotininu.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/51271372515.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/34898747173.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/zametidu.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/1806715375.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/wonavewese.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/88302944416.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/joduva.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ougujcrp3h713ibgii31m1np9l/74847244668.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/wisog.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/10839669592.pdfIn PDF document text
    • https://digireg.si/upload/tokegeni.pdfIn PDF document text
    • https://uudanbury.life/files/file/getoped.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/betimarojiledufifipiv.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/taluzaf.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/52910560007.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_off0000ad0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0D 11100 bytes
SHA-256: 8ae33a753d34d90155f698c7ede95b0454812038059a75d3a8205a582f06370b
font_01_sfnt_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 14508 bytes
SHA-256: 8be7d7d9d3d6c821d3d4bf589bbebe42ac4775cde7b1ee195264f497231d7086
font_02_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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