Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a86f0d17da9f2f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 16:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2cec6fe9e3bb028e22bff4050ce2e9 SHA-1: 08676e5fdaafe2f125772814999471f0f0887d41 SHA-256: 41a86f0d17da9f2fde3b074fb27707c46f972663dcbd1235573be3bf815d5425
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. Heuristics indicate it functions as a link farm, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=desh+pujabarshiki+2020+pdf+free+download
    • http://sarkar.ie/userfiles/file/43700123293.pdf
    • http://hotel-ambassador-nice.com/upload/files/1088732021.pdf
    • https://tidaksusah.com/contents/files/pebobop.pdf
    • http://safetruck.gr/images/file/1735730992.pdf
    • http://otoozevran.com/resimler/files/mofevevotezini.pdf
    • https://abzesolar.com/uploads/files/bumixowe.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/boworidanetitotafibi.pdf
    • http://tinhdauvietnam.vn/upload/files/jikix.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/85395070907.pdf
    • https://tndvn.com/js/ckfinder/userfiles/files/10132501849.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/sobupasiro.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b3404cd8a13493ec4530db942692bdce/31710368885.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/timexu.pdf
    • http://www.cerel.eu/images/wyswig_images/file/3472145667.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/wulepanapoz.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/bopodokufizakiwejiregom.pdf
    • http://studio-rivetti.it/userfiles/files/7464992082.pdf
    • http://tichdiem.surecare.vn/uploads/userfiles/file/seropow.pdf
    • http://dientrotiendathc.com/media/ftp/file/xibilepibekalamevim.pdf
    • http://dkind.net/userData/board/file/19158745759.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_off0000ba64.bin
bc919ec019a7ae4d2443d05cc38d4430ba2212ac1ce90c4403dfec0875eb2758		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 19684 bytes
font_01_sfnt_off0000ee64.bin
d4d80d48dea18be70fb39c6f3170cabb2f642b2a664eec9a0dc863c5081dc31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 11288 bytes
font_02_sfnt_off000108ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes

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