Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fea0332d811415…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 14:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d6a6da300608e0bacbebecc09ab8eff SHA-1: a422e1843b090ec5d9395c22bcbfc2f7f69c4f7a SHA-256: 18fea0332d8114153740ba7dd09ba066548141bb7f9a60d9a5aa9fb2aae0ce18
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 Weebly and other hosting services, indicative of a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged this as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to potentially malicious or deceptive 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://leonvi.ru/wix?keyword=williams+intermediate+school PDF link annotation
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/5605dc42e43.pdfIn PDF document text
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/potofegu_jenogem.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/ieJdVid/23085791001.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/eP9jdjf/puppet_soccer_striker_football_star_kicks.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/WRk7mjc/kubafedegejivoserazapi.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/jjjg325/35697141642.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/jyichew/tes_uji_sim_c_2019.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/limewub/kopigasegodiberona.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/varojopurokazedigusake.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/kuzozudeneredinaxuti.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/zombie_catchers_game.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/shiva_cartoon_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/97144129630.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/tratamiento_fisioterapeutico_para_hernia_discal_cervical.pdfIn PDF document text
    • http://titasigor.epizy.com/lolozeg.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/cookie_clicker_2_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/apply_for_british_naturalisation_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 5192 bytes
SHA-256: 132de9cdf95d4481e7ef2c86a8279351f26bbac22bbe6bb6bd81a172e4aa4c83
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10356 bytes
SHA-256: 524fb1dfa4e75b3e0ed3b69d0d80eb270e7081ff0edfc804fa894eee00d8981e

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