Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c1e0b3054b9659…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 03:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0715e5ca45f0de9e4a1e53310bb1400 SHA-1: 3bfe3433124574baafff7cb7d896d6825b0dd211 SHA-256: 62c1e0b3054b9659e9df2b318cd39d961a199b5884c0047536cc3b7881fcf43e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external files, suggesting it acts as a lure or distribution mechanism for further malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zhavezbozi.cz/data/file/latifudaje.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/92732021107.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/jujumemupazazepaw.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/68460267354.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/palunajifavobelalam.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/muxalax.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/lunisakugi.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202197711456978.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd8a423c5---89105354503.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenitemivojupewofuloge.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/98408072429.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/8136862651.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210911_F5193DE2BFBD6959.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/vegagiritifafiziwuma.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/24050833358.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/80816259574.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/99929253167.pdfIn PDF document text
    • https://asiahealth.standrewsdentalsurgeons.com/ckfinder/userfiles/files/zifivex.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/kigojimiwoganasubigavixiw.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/45093968826.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bavik.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/59361374188.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/4254755573.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8037f85c---sepixa.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/valogivebuzazimivafu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/sirivusevinulawatozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=winner+of+indian+idol+8PDF 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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10280 bytes
SHA-256: 547c8bb5265ecfd22549257276179e6959c1f872cdafacb2849662035a6ba900
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 18052 bytes
SHA-256: e5c9a6ec0a683d2136c12dace2e622f91d3b0445992735f36b7e8a5f2a90fefe
font_02_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1