Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37cdcc625633947…

MALICIOUS

PDF

137.1 KB Created: 2021-09-20 20:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10dd4b16dcc92de0ae22551e73b8988e SHA-1: 3662955ba8131a987983831a7c5e1beb1994e203 SHA-256: d37cdcc6256339479e2791f34b231aea14ac8075276ca117536b6bf1a3b6c2ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true malicious destination. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://plenaseguroseprevidencia.com/fotosempresa/files/sazewetejuputed.pdf
    • http://ansing.nl/userfiles/file/86329235646.pdf
    • http://abwjefferson.com/uploads/files/32229726518.pdf
    • http://4reality.cz/userfiles/files/6706194484.pdf
    • https://marathonlaval.com/userfiles/files/20706955009.pdf
    • http://whipitleather.com/userfiles/file/dufenamonakuti.pdf
    • http://castudio.eu/userfiles/files/zujivizoxofopananani.pdf
    • https://heritagecambodiatravel.com/userfiles/file/tizibepumimofaragidide.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/56494364176.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613812f6f0345---48131907424.pdf
    • https://gloriamus.org/Uploads/userfiles/files/xoxowebezofozuxenixefe.pdf
    • https://salonrewards.ca/images/file/xijijefowapu.pdf
    • http://miskolciharsona.hu/pictures/file/pemamelobezi.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/79036812275.pdf
    • http://shriramashramps.org/userfiles/file/seputupofak.pdf
    • http://lnaixi.com/userfiles/file/20210903092834_1514819329.pdf
    • http://chiangmai-clean.com/user_img/files/28151385619.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///14739366966.pdf
    • http://webmba.fr/client/logo/file/93589453243.pdf
    • http://sellmysayarah.com/userfiles/files/ziwex.pdf
    • http://aryajob.com/user_upload/file/kasugomulebijebalejir.pdf
    • http://offerseir.com/basefile/offerseircom/files/nolisovefetipowiv.pdf
    • http://hoanhaochemical.com/uploads/files/73544330071.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/91384339472.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+cheat+clash+of+clans+2020
    • http://perfecturology.cafe24.com/upload/editor/imagefile/82810612826.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b3e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3E1 16792 bytes
font_01_sfnt_off0001cbf8.bin
e7665be8e5a54433757cfb157ce8db4c3a106ac497a60f7ec9eeb2fa833b9031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBF8 10560 bytes
font_02_sfnt_off0001e41a.bin
091332d2ec2c2acd0ad4cdbf86540e857a76ca8ea8a5f22b8dea5833ba78cd75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E41A 19316 bytes

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