Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c858aa6e97faa2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 15:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba035c0f4265d3a8b54b7bbff6e5dfac SHA-1: 5b47d47e03b6c9476ce8135ee6ad3742687bee41 SHA-256: c7c858aa6e97faa255d91eeab318963473f0f8167c27547bca08ed06e6c1793f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://aihyang.com/userfiles/file/sevowizimarop.pdf In PDF document text
    • https://pacpartner.net/images_client/imagesfile/vulezedirutoxupituxono.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/bobuwixugufudezo.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/98307835087.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/74527677332.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/85903260778.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/74364446461.pdfIn PDF document text
    • http://zamgph.com/uploads/file/042354509324.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lewunuronozopog.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/kuvezu.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-8/20210908062524201708.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/tiled.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613595c74d9a1---tiwig.pdfIn PDF document text
    • http://ccsl.asia/files/woniw.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/66398818983.pdfIn PDF document text
    • http://e-district.org/userfiles/file/78962682296.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/rinosusaxuwinuniru.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/javajukeju.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/76144988298.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/29428536050.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/95324174392.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/10755415077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+menu+icon+sizePDF 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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 19900 bytes
SHA-256: 03a5c1ff59cbd1c465c303520bbe3a45fd448ded7d060d94b4d3b752b9a1fdec
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10368 bytes
SHA-256: 4407b1a24dad19ffce4d194775f135eb4f0527f6165446d026b52a44fb07552d
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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