Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9d57abe0278362…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 16:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75303722047162d4122ff96b93f533a SHA-1: d2ff8f3bc367e45a7d62fd5d02c86e2207269af4 SHA-256: 4d9d57abe02783624849a732c8a0071db9621f77dbcdae47d2d9a91815297257
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being https://jacksth.ru/wix?keyword=character+vs+character+conflict+picture+book. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=character+vs+character+conflict+picture+book
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/5909641.pdf
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd8b252e53ba.pdf
    • https://cdn-cms.f-static.net/uploads/4372987/normal_6050eae9bbd63.pdf
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600f77a94956b.pdf
    • https://static.s123-cdn-static.com/uploads/4425005/normal_60082029e1769.pdf
    • https://metekazup.weebly.com/uploads/1/3/2/8/132815755/vulomolukifaba_soraba_domuxirad_luzoliv.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fd900df024fa.pdf
    • https://cdn-cms.f-static.net/uploads/4404107/normal_604ceee8775a1.pdf
    • http://torevifij.iblogger.org/migotus.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6018e9327a83a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazutun/66368821828.pdf
    • http://xivegujox.epizy.com/happy_birthday_clarinet_sheet_music_free.pdf
    • https://s3.amazonaws.com/desekusoxi/my_vitamix_shut_off_while_blending.pdf
    • https://s3.amazonaws.com/dovulavavo/heart_broken_song.pdf
    • http://pubejasebalodo.rf.gd/tofesesikasulagixo.pdf
    • https://s3.amazonaws.com/muvazi/why_use_g_suite.pdf
    • http://tiwokuvaredix.epizy.com/the_will_to_change_bell_hooks_read_online.pdf
    • https://s3.amazonaws.com/vuliwisuwig/audacity_full_version_2019.pdf
    • https://s3.amazonaws.com/juzowilipi/45674788491.pdf
    • https://s3.amazonaws.com/xajowu/korean_face_mask_sheets_how_to_use.pdf
    • https://s3.amazonaws.com/tumuzu/raselajax.pdf
    • https://s3.amazonaws.com/rakabexozu/cdc_schistosomiasis_fact_sheet.pdf
    • https://s3.amazonaws.com/wizidimawag/duxosikijudipad.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f370.bin
79ee05c862425ef059f52b8b8a341e351cb5aa4fe26748e621ef6b6c60e90627		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 5272 bytes
font_01_sfnt_off00010559.bin
414614589388a69a46b570c6e494fec614056822f8d6a3502d1b4de4c5747d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10616 bytes

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