Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c26b8c31891e9c…

MALICIOUS

PDF

138.0 KB Created: 2021-02-25 23:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9aed32e8ec38e10b5fc61ae5d66854bf SHA-1: 5a119be2f08bc8c3e136af99a61658c48f3c1bab SHA-256: 76c26b8c31891e9c4f7205739ec95bd4939e27beafbb3886c40b7a93da4953cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. One of the primary URLs, 'https://leonvi.ru/strik?utm_term=the+last+leaf+o+henry+questions', is suspicious and likely leads to a phishing or spam page. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=the+last+leaf+o+henry+questions PDF link annotation
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/02d5af.pdfIn PDF document text
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/42c41c.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/hgcgcpV/tedosizafuletowixumirib.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/wulupo.pdfIn PDF document text
    • https://zedunuburow.weebly.com/uploads/1/3/4/0/134042823/gelagiwu.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/jozotovatejas.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/zedokewovizuf.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/vazopopekowawer.pdfIn PDF document text
    • https://vewiwuxipax.weebly.com/uploads/1/3/2/6/132681682/pizenurusopa.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/how_to_build_ingenuity_convertme_swing-2-seat.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/crystal_reports_viewer_old_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/book_review_format_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/blur_background_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/9646436898.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/are_the_star_wars_books_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/bruno_mars_marry_you_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/lazixalotogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/34101771231.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/battlefield_2_euwin_beta_5.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/mary_rowlandson_a_narrative_of_the_captivity_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/ants_go_marching_music_sheet.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001f362.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F362 12360 bytes
SHA-256: a09ee8a70edb9640d179043d93e6cf9a900c80af3f6031202a13589ab02084ef
font_00_sfnt_off00019d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D35 5032 bytes
SHA-256: c00a569e75972c9f5a095236cfae73feb987111f0ffac3d5886d7acfbe012981
font_01_sfnt_off0001ae52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE52 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001b9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9B5 10684 bytes
SHA-256: fad1c92e8c42fde28bad3260702534ffd6e6b1d6d14e788ceb1236558b01b23a
font_03_sfnt_off0001de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE4D 16104 bytes
SHA-256: 223e96291d2677202d9b1a8f031cb3a8d11ad23b70b868216b76b7153c327325

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