Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabf9d22ffd91d16…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 00:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbd7d26c98bd3458fc2ed2ff5487e69c SHA-1: 4982d307a82409502f5fc7e1ead14835718a2833 SHA-256: aabf9d22ffd91d16d2e738b13ae8c4b87b4ece89ba70635ea6c6104578e475ca
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=wwf+wrestlemania+the+arcade+game+apk PDF link annotation
    • http://jlicentral.com/images/authors/file/10536834853.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/dobikobozeveduzorajejodud.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/datosafimepoketexugifoge.pdfIn PDF document text
    • https://kawanmto.net/contents/files/99068857455.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/18064931024.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/nitedugako.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/36908497184.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/93283113873.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/20608803031.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/19328864129.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/15140759966.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/79388144407.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143230833050---69034053122.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/4568027279.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/63689116979.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/49344350965.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/23529505078.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/bumeveruxavebo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb0b88c98---76861222242.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/dajijaguvapikuruna.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ruvubutugezax.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/47690552229.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/74864755042.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 11120 bytes
SHA-256: 54fe3b7b08cd5bbf4794cf82c2386cf5758c87df20bc89834e4420b128a04c26
font_01_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 17796 bytes
SHA-256: 992bcda707678871d613e0376cb9a67460b5f282cb8fc421daa055c820c2aa27
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1