Malicious PDF — malware analysis report

Static analysis result for SHA-256 5053a39ada58235a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 04:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2147f62027babc883c37d453d05ccd23 SHA-1: b3e3a432673b9d723401cd2c23a2a385b25408a3 SHA-256: 5053a39ada58235aa4648913e97291926c61b90819666116d4ded80887320945
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attempt. The ML classifier also indicated a high probability of maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=fcuk+telugu+full+movie+watch+online PDF link annotation
    • http://sxsasa.org/images_fck/file/1631484119.pdfIn PDF document text
    • http://gro-felix.si/uploads/88488635164.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/moduvuwovadegobaworomaduj.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/konarolunalozitefi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/42886851826.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/worepeke.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/95289032985.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0d7153ceaf7f041bc67176b20cfec568/58396709146.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/23865710168.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/1784915365.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/39345290221.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/4397447379.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/53840672355.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/zelefulavik.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lojabawepagusavuwur.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rapimazimujaluzifoponu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/gopibib.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/ramixutolizewefogo.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/lenoruxazewopatikavavasaf.pdfIn PDF document text
    • http://sartor.ru/upload/files/mulepoxozekubifo.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29347247317.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/wakobudegokebogex.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/6186290691.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/winigobaba.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/diribavotovi.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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 10836 bytes
SHA-256: 6ebf2faf7574f15e0186982624bf575e929d3390bcb90b912094bef1b54b94ed
font_02_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 18424 bytes
SHA-256: 66739324d394f5ad418ed0ab6c81097eacc994695689d4e7e8ee5bb9a8c5b663

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