Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb883e535c0f95b…

MALICIOUS

PDF

79.5 KB Created: 2021-04-27 14:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fd52791e78fcd17dd79a275787f5dd9c SHA-1: 41e39e525e1ab7e1f0b7c599acbe6cada64ea191 SHA-256: afb883e535c0f95bb003f77a2f5adbef10b63820550ce25a8a49cec3a495454f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a spearphishing attachment designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=lactancia+materna+exclusiva+concepto PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445103/normal_5ffc30649c294.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/gaturugerora.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/ringtone_love_song_download_2018ueyhq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_602b9742150c3.pdfIn PDF document text
    • http://glasshookahcatering.com/18381533219h0lf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5ff3866ff2264.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/nutavel-penafenawaguba.pdfIn PDF document text
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/ramivufunigejemu.pdfIn PDF document text
    • http://yatvoyya.fun/86608023267ow69h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulazelof/ieee_sensor_journal_latex_template.pdfIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_1b35b278d14f413cbb4cd7569d15e21d.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_71f41039125a49829cba0c84a808fffb.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_dac57f98f2ae4d03b0bce54bdb527ec9.pdf?index=trueIn PDF document text
    • http://jemukiguwuw.myartsonline.com/8d_problem_solving_form.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/song_lyrics_i_cant_stop_this_feeling_deep_inside_of_me.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_a68bac44ef6e4f5cbac4aedfb2c03344.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/the_lion_the_witch_and_the_wardrobe_peter_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/how_to_make_a_cheap_wood_splitter.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/zipekikujiwefaxe.pdfIn PDF document text
    • http://pekiluji.atwebpages.com/arabic_translate_to_english.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_1c1d61e90c7747f7ad1f38716638d325.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 5148 bytes
SHA-256: 21398092d225c11612a83944030e67b33253d6b346f77a4453dd3326e81e9011
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11364 bytes
SHA-256: d44fa35b27d01e2263b4e305a0f1db8505df6681d0306f59d5d90e489d9bdb8b

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