Malicious PDF — malware analysis report

Static analysis result for SHA-256 7462ae7432e6a318…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 04:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6d129f213f360e01ec2d04d17dcc16b SHA-1: 07edcb8c59eedb14ab42b60114dd41c80f91a29b SHA-256: 7462ae7432e6a31824d0870357000e7049ba3903388a95f6db85ec2aa734faba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

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
  • 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 http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901062149930886.pdf In PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/muniwavavikubozuletasul.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/31126631760.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/tiwifib.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/31737837099.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/34974543636.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/58257946364.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/sekusagosenunuwadoj.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/dirudepisevowik.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/56184412123.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/boguzu.pdfIn PDF document text
    • https://rubfila.in/files/file/nixipudej.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/57105135870.pdfIn PDF document text
    • https://bnovum.hu/downloads/dozemusebax.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/88795673565.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/39972846387.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/3900935994.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/30724120841.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xisubozupugejig.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c67957050---zudebos.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/kisanigapisasabirijixeped.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/1060102541.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/13976033535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+transfer+contacts+from+smartphone+to+basic+phonePDF link annotation
    • 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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10916 bytes
SHA-256: ba5aefed8ce52f94612fdf6387319fd0737ccc4a0186980c8eb8ba5aad5d8080
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 18108 bytes
SHA-256: 734d587d0acb0cabba7b3d97d40d18e6485acb3c2852d03c61844cd0ab48630b

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