Malicious PDF — malware analysis report

Static analysis result for SHA-256 c145df4dfc3a6dae…

MALICIOUS

PDF

73.1 KB Created: 2021-04-03 20:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 78c308821ffae89441b3da369909a893 SHA-1: 5aa9573c3ea8ffb6b2e8a2861a9b8e676e8a94a0 SHA-256: c145df4dfc3a6daeb79986c0f9be087a418c9e02dcab8a245710014f7be6406c
164 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 other PDF files, indicative of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/wix?keyword=tabe+test+answer+sheets PDF link annotation
    • http://finoginujowiwi.mypressonline.com/zisef.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/metafsica_aristotlica.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/ia49iiM/nosebux.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/e8ca59a70a1f6e0.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/901236e.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/57754857281.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/phn_mm_chuyn_t_file_sang_file_nh.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/spring_street_international_school.pdfIn PDF document text
    • https://fexipipovunozem.weebly.com/uploads/1/3/2/6/132682859/vewoxa_bunekopunebufa_xowazanuge_lasilap.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/xabanuvoji-zisuxorenib-vetunovubig.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/kudavikuxa-nazoxip.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/13475476259.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/zhfhaij/17275713842.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/best_app_to_listen_to_music_in_car.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/ehggchb/pudetusekamilinepozevog.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/zetubakuz/literary_techniques_definition_and_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/gelijukorukitasosapep.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/carnivalee_freakshow_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/50388770029.pdfIn PDF document text
    • http://zimopup.myartsonline.com/model_3_overnight_range_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/wireless_network_watcher_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/800555504.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/bhakti_songs_video_hd_free.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/siwumufasozon.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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 4924 bytes
SHA-256: 7d8ce6b296688a4227acfb61fcfc1da4fd9fb81e65d7822f3470b8a399ea7454
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 12612 bytes
SHA-256: 164c753bd9f412175b0c7ac1218c84db0ab4509cc39363473c5447d98321d515

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