Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de794a13e556267…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 13:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c385b7ccf117539ce6a1035e19982e70 SHA-1: 9e977b8dde155112a473759524dc3efc3b65216c SHA-256: 1de794a13e556267a572ff11bcd5231cc145eb5508b3c27945c61e293f3f3c3c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into believing they need a password for an archive, a common social engineering tactic to bypass gateway security. The numerous external URLs point to a link farm used for distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=game+top+windows+7 PDF link annotation
    • http://erainbowrealty.com/userfiles/file/menudejevokuvelavido.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/fumipajupaf.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/zevonilul.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/vizepadexe.pdfIn PDF document text
    • http://eva.am/files/153a6ac84290a3f3.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/26440065025.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/mokup.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/ronezipozonuline.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/21449529256.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nadagusovifu.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/rekanoset.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090920115964.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/63176030745.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/magovusokomibu.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/59720563409.pdfIn PDF document text
    • http://potlista.com/file/files/revikamikilimilen.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/xugalemusumamis.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/011152509727.pdfIn PDF document text
    • https://led7.ru/file/87675016346.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/bedefimow.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/pixudopaputunigapo.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 17940 bytes
SHA-256: e6316854397669080fad771dcdfaaac8ec4ef1d3126f02299c95eac55814685c
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 10580 bytes
SHA-256: 04612e2489af874c4b86e29e6b56e105c5bde93ffba59f63d38dfe0584e56ce1

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