Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1cd18ee1957185…

MALICIOUS

PDF

86.8 KB Created: 2021-06-01 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b38d6e1f21102a52390f4213963f0d9 SHA-1: 0dfe72c8e7a380028d4184c512e2bed9b31ef3ac SHA-256: 8c1cd18ee19571852238aefe232cf929a22aee802ea9635813e2d8e0d0a8cf75
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, suggesting a link farm or redirection scheme to host malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest an attempt to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laborke.ru/pbw?utm_term=super+city+hack+apk+latest+version
    • https://cdn-cms.f-static.net/uploads/4379859/normal_600b1f3fa1df3.pdf
    • https://cdn-cms.f-static.net/uploads/4497358/normal_600f1f0b05249.pdf
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/giziluguruwa.pdf
    • https://static.s123-cdn-static.com/uploads/4384160/normal_600773d5c4605.pdf
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5ffa03edde855.pdf
    • https://bavutenodedob.weebly.com/uploads/1/3/1/0/131071315/towuxetezexulif.pdf
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/8955917.pdf
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fe8b6a63d363.pdf
    • https://static.s123-cdn-static.com/uploads/4370278/normal_600897045031c.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_60451ff3babd4.pdf
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/pitera.pdf
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/wafakaximesome.pdf
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/pivakurarunobofi.pdf
    • https://bexatumabe.weebly.com/uploads/1/3/4/8/134852132/susaxoxotowiwire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lakebimutep.pbworks.com/f/77698120220.pdf
    • http://xujefix.pbworks.com/f/18252092078.pdf
    • http://dipoziw.pbworks.com/w/file/fetch/144439581/bimitowebovaduxusotu.pdf
    • http://zopujoxobug.pbworks.com/w/file/fetch/144412131/80000745359.pdf
    • http://letonepamusi.pbworks.com/w/file/fetch/144440469/homophones_and_homographs_worksheet_with_answers.pdf
    • http://moxulolo.pbworks.com/w/file/fetch/144441198/sample_recommendation_letter_for_high_school_student_from_guidance_counselor.pdf
    • http://nefusim.pbworks.com/f/peter_cardon_business_communication_3rd_edition.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e531.bin
88734bab47c2b0f5c561f6f16f71221550883f4602fba027a01f2e008295c190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5352 bytes
font_01_sfnt_off0000f763.bin
c04b68a654f002bc4eb57db9bbd2289ddaab5cb82f59c22bcdbcec34f395c17d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 7196 bytes
font_02_sfnt_off0001100a.bin
13b3905c43e6e3195a46a31a89cc3d3f59d5ebd17a7c5b0bcd8aeb910967c392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 11248 bytes
font_03_sfnt_off000136c2.bin
88cc286b74a0991597896ebe959c9358a371cdb5445c0c66cd6ab273b34ba6e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 16664 bytes

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