Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a2675966c9288d…

MALICIOUS

PDF

73.1 KB Created: 2021-04-03 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f667cc22c47ff1f39f2b835870d302e SHA-1: 783e1148d7960a81e695d0befd33b438dbfadcfd SHA-256: 72a2675966c9288d6044efda4a2bd060c95798a8386c66c06b69eb73e0c0ccd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/aws?utm_term=ghost+boy+lil+peep+guitar
    • http://nufudoze.getenjoyment.net/ukulele_canon_in_c.pdf
    • http://mybiol.site/23828321330a3gfs.pdf
    • http://gopidap.scienceontheweb.net/dozanutoliw.pdf
    • https://static.s123-cdn-static.com/uploads/4366408/normal_5ff19c9a46f94.pdf
    • https://cdn-cms.f-static.net/uploads/4368756/normal_60481704417b8.pdf
    • http://betflixguvenilirmi.com/370197154330ppc8.pdf
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fd7ce3382e45.pdf
    • http://erogan-oficial.site/69753320038lnw7m.pdf
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5ff763dbec3a2.pdf
    • https://cdn-cms.f-static.net/uploads/4465142/normal_6019831624278.pdf
    • http://belplitka.ru/508129082844ynca.pdf
    • http://pumba.fun/how_to_dress_for_garden_party_weddingrxqw4.pdf
    • https://cdn-cms.f-static.net/uploads/4476122/normal_603e827ae5fa9.pdf
    • http://mawosatejojeka.sportsontheweb.net/90751193404.pdf
    • http://madokedaxemosu.22web.org/skyworth_65ub7500_specs.pdf
    • https://cdn-cms.f-static.net/uploads/4465707/normal_603e7010afe9e.pdf
    • http://geosen.net/kagadyfhmv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://najijojovigom.myartsonline.com/67823717179.pdf
    • http://vujulazi.epizy.com/85166985406.pdf
    • http://sonowodiguvab.epizy.com/dubixeju.pdf
    • http://telomilabevi.epizy.com/hallelujah_violin_and_cello_duet_sheet_music.pdf
    • http://redifigikutusoj.myartsonline.com/rinnai_gas_stove_price_in_pakistan.pdf
    • http://tokeximu.epizy.com/vuwajivoxefe.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://scripts.sil.org/OFL
    • 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_off0000cb65.bin
913aa9050689efdce66f7ca5b3c7bfc978bd5a2f01e020304cb3f8b54bce8799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 5352 bytes
font_01_sfnt_off0000dd9a.bin
94500d1adff2322d3660fc25f8592d9f0992c26d3fcbf10853a20be578661a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 10488 bytes
font_02_sfnt_off000101c8.bin
050cca2678d7435c270027ff58d84efa212ea3c5592871ae9bdc0d1e185112d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 16076 bytes

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