Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41e212e5e98dad8…

MALICIOUS

PDF

87.7 KB Created: 2021-03-07 01:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df04fe97039436e2f525ccc6bd0d09c6 SHA-1: 49b51465c063861488f84519fd3d2de5d6531f2e SHA-256: f41e212e5e98dad8c8fab13a1fdfa863d161492bfdab3dde35ffb68b2dcda671
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one that mimics a search result for 'how much does it cost to learn mandarin', suggesting a phishing or SEO poisoning lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly indicates maliciousness. The presence of embedded URLs and a link farm heuristic further supports the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://bologen.ru/strik?utm_term=how+much+does+it+cost+to+learn+mandarin PDF link annotation
    • https://cdn.sqhk.co/bisegepamitu/hJZhbd7/amazon_hey_clay_bugs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5feb2586ce87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602b47fc32ba0.pdfIn PDF document text
    • https://nimijakis.weebly.com/uploads/1/3/4/5/134577625/wusobepukam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6017f6af410fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5fdfc93fd41cf.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/deretajutono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_60295ece2fcb9.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hdYvQeY/ninja_dragon_symbol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5ffc310295c81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_60375ccba9cc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fc5ce61a2704.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/5229255.pdfIn PDF document text
    • https://wabelorija.weebly.com/uploads/1/3/4/6/134685543/00c74.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/rudabenewoxode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff51def42ad2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2e51cc183dca4a6581601761c0ccc288.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_7f83ce49151d4fe7b115c47861c1fc29.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/free_printable_3rd_grade_math_review_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/excel_bedingte_formatierung_farbe_bertragen.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/after_effects_logo_animation_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 5116 bytes
SHA-256: f2f701ef7d7750e65c7946b6644b5a66464379e3c00da7e4c8377700f2f71bbf
font_01_sfnt_off00011a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 11544 bytes
SHA-256: 928fee59948113cab2ea847a61af6aab65dd465df7a3c96560f9380b01d7949a
font_02_sfnt_off0001417a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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