Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0109d0923c6a066…

MALICIOUS

PDF

84.6 KB Created: 2021-04-18 19:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 986cd43780a32e490957014de3870a9a SHA-1: 70c464bf196d3a43962c48cc75ed6b34c14d00da SHA-256: c0109d0923c6a06613b3d059e77a3cbc1b83423e4ce45203efa48a034b91c7db
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-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=dr.+seuss%2527+how+the+grinch+stole+christmas+%2528film%2529+cast
    • https://fiduludebiwoki.weebly.com/uploads/1/3/4/3/134317875/6266307.pdf
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/nosabaw_rikotuxuvojuf_porisepuwirobav.pdf
    • https://cdn.sqhk.co/rotelizedo/idAfsij/one_gold_review.pdf
    • https://cdn.sqhk.co/rudixika/hqEXdfD/62733491482.pdf
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdf
    • https://cdn.sqhk.co/bomemenun/hbbigjd/4096812354.pdf
    • https://cdn.sqhk.co/fowoleleda/njalLgf/electronic_components_store_san_antonio.pdf
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/vokulasufesivan_korefisa_wetegadi_ludosabotikimo.pdf
    • http://gisimijesizugo.22web.org/43158034918.pdf
    • http://posurazatux.mypressonline.com/addition_word_problems_for_grade_5.pdf
    • https://cdn.sqhk.co/dediwifime/pOoYejb/jelly_filled_pastry_7_little_words.pdf
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/3938104.pdf
    • http://vegofejolafud.mygamesonline.org/65516249922.pdf
    • https://cdn.sqhk.co/kigimole/ciiigjg/tiles_hop_edm_rush_no_ads.pdf
    • https://cdn.sqhk.co/jarogofef/qDdjdii/xosebivovupup.pdf
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/5263434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e4dc6eb-813c-429e-94e7-83e138dab635/83186619118.pdf
    • http://dinilemave.epizy.com/gejigumud.pdf
    • http://mesesoriran.epizy.com/kepef.pdf
    • https://uploads.strikinglycdn.com/files/a06b1f6b-c3ef-436c-9fd3-d5c5158ca3be/95559381223.pdf
    • https://uploads.strikinglycdn.com/files/8ec7a450-c951-46ce-9410-7510a5d8a28d/how_long_to_train_for_half_ironman_from_scratch.pdf
    • https://uploads.strikinglycdn.com/files/40266e04-fa8d-47d0-ad95-95bdb6227cf3/bagudeb.pdf
    • http://gewumene.epizy.com/problem_solving_test.pdf
    • https://uploads.strikinglycdn.com/files/64f4a357-45bf-4ef0-8536-855c2d6c2ff5/fisher__paykel_active_smart_fridge_freezer_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010931.bin
b94be129157def253e91ed73b8ce754e875f7a333fc6cba0183601e457cd1f07
pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 5608 bytes
font_01_sfnt_off00011c55.bin
7d4f2ae1bce5d80ad3b648e30985eeba82f92c545e85b327323660239c7311f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 12188 bytes