Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3485b03b2d03927…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 23:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7d2fa32b1f7dc2e109c11c6c329068a SHA-1: 4302a125023b8071d1dbad98924c1ac360760af8 SHA-256: c3485b03b2d039272d8f23387c22060f3e646f6a7487c07c45c4828ed77e5461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with one prominent URL suggesting a 'Clash of Clans hack' to entice users. The presence of external URIs and the link farm structure indicate a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://e-skala.pl/userfiles/file/komotefekonimixapolinapu.pdf In PDF document text
    • http://karlsbach.de/userfiles/files/1344533300.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc56f2e5d---puvog.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/73228400869.pdfIn PDF document text
    • https://scalping.ir/data/files/file/faxaz.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/bomidefu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090800330873499.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/vebotojivafilotisirexiwo.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/14945670848.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/muzudekajogiriteje.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/22378309455.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/65632044340.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/xugidinejozusifagaxemi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gokukim.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/korewa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/sanonapud.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/87718261646.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/75413571762.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/mupupunuzuk.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/25974669066.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/texepenedakonunewoger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+hack+android+downloadPDF 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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 16792 bytes
SHA-256: 3f47e72f8ed84fd4f29be5392e4fc2048416838e5b2dd6829e260fc9f9a4db35
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 10552 bytes
SHA-256: 2f18c83a4ac0c226af835bc8a83df040de1e72bca8b030c4415cee9cafcc8077

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