Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f100642fed278b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-14 04:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0b7dce6b76016f596a77935bfdce730 SHA-1: 757482460c58c836211cc00a4eb83be89dfdb06c SHA-256: 89f100642fed278b540e6bea9400ce1823c74b6e48ad1847e67b6bbd8852db63
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded URIs suggest it's designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/uplcv?utm_term=sniper+3d+assassin+apk+download PDF link annotation
    • https://rijst.nu/userfiles/file/noruxikanitukege.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/tekemizupuxep.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dalaxas.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/38180182128.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pajotefubasoziga.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/3758001016.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/16497966969.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/2343971756.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/faveropipetaduzotuxodix.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/90762780734.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18353628286.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011548199255.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/79803029981.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/4437045130.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xizamoxelisovunire.pdfIn PDF document text
    • http://edituj.cz/res/file/4166688645.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/sujumaguwaw.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/11200978155.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/46485507104.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/rigaxurosogutot.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/befanikeganewib.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wekegafuropozowezexopakug.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf848a280---lefagizimatigobun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6cedb60f---sewunigasajomi.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/nivudagoro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 22320 bytes
SHA-256: b16a5cda87bac23a337ad1337f79a59aeae44773ffc9983eaa88b3cc6d198775
font_03_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 10712 bytes
SHA-256: b7dd638210058763bb8ad38c644120d2c18f0d667e949f458aea1ceff0dc0ea2