Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea29b1b6d9a414fd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 00:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fa5171e2aefacbfe9c5cb30f81663e8 SHA-1: 603c832887faed410091237ea9b3d094bb8a5503 SHA-256: ea29b1b6d9a414fd8cb3a58eaf597f541f1dd42f5e365451f23b5e539e639a64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=basketball+shot+apk PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134b87e987bd---tekulixetuzawoxiwumome.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/tanisijolejifupekekemepol.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/nukijolo.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/41643998233.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/21048165079.pdfIn PDF document text
    • https://intersat.lv/files/file/30879118955.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/79629859412.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/wefuzujomudotel.pdfIn PDF document text
    • http://meditopthailand.com/file/pasonaziwerumusebomobo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092423302664.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lulagizesanaxu.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/zozuradamutufavari.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/96622301081.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/sameboduweja.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/40515608322.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vajivakefozujur.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/21/82200863888.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/19963693060.pdfIn PDF document text
    • http://dakmet.pl/upload/petabu.pdfIn PDF document text
    • http://chenruichem.com/upload/files/19190439662.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/64476956208.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9b88da4a4---komodilevufas.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/72030279061.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/37746768867.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nozaxakupovokiwimifan.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_off0000b204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 10336 bytes
SHA-256: 89a2083958bc43fd19fd9b953e03fadd094b88dc2a9d1925cf6025694e051f0a
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 14696 bytes
SHA-256: 780203c47f51724c29e63eb05901d06798adc0fd313941cce8a6c3500837dd24

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