Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14077993e5d7d58…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 20:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d9b0901a7878603cd1186c7ba238069 SHA-1: 1283ee4a2d35be378f58f9ac9f0703ca9368999a SHA-256: c14077993e5d7d58375b6218bf2ae4da2afd4bb78effa8ed788ddce73b3e4110
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely involving a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=transfer+photos+from+mac+to+android+phone
    • http://koslita.eu/ckfinder/userfiles/files/46255067092.pdf
    • http://portamarioarchitetto.eu/userfiles/files/fevijexivedorolut.pdf
    • http://szentdorottyapatika.hu/files/fejoxupomewuxunuw.pdf
    • https://texigo.tw/upfile/files/2021/09/05/wasufejojodipufivotev.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/6939227375.pdf
    • http://worshipedia.mobi/sites/default/files/file/volavivunemofijojes.pdf
    • http://www.veslovani-vsb.cz/soubory/file/bemixe.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/gisikamizefodudut.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/31655041390.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210908_F84C921810A54913.pdf
    • http://yyfxsw.com/upload/files/51386475580.pdf
    • http://halaljones.com/uploads/files/vazujudekilezuwakaw.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/mowexize.pdf
    • https://volandovia.it/public/fileeditor/file/jaxasifegamupajorikamori.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/bedamoku.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/53967428876.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/30824709386.pdf
    • http://tai-group.com/upload/files/34465330651.pdf
    • https://agrimal.pl/userfiles/file/burofotuvuzek.pdf
    • http://megalabsrl.it/userfiles/files/68288722549.pdf
    • http://grupophi.es/uploads/files/diletuja.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/matifepoloxig.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_off0000c921.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 16792 bytes
font_01_sfnt_off0000e133.bin
ae2891ceb0c2da53177156ad392e8e0162e9fad8544c7cbcf953254efc126984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE133 17380 bytes
font_02_sfnt_off00010de3.bin
1e670c47633afc0e6054be826bc2d5da9e21bb8455bc92e9101fd9219f23a791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 10800 bytes

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