Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b9c24a7db09407…

MALICIOUS

PDF

70.3 KB Created: 2021-03-23 21:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe8ea3ebea9867956ea4848d0e156556 SHA-1: 114cf2d19c33d53b2e87c49601d8148cadf3a97d SHA-256: c5b9c24a7db09407f0d6559201c23ebb1ec1d8134826719a8eafa57d5f2a44bf
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 of which point to other PDF files, suggesting a link farm designed to host malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=ground+guide+army
    • https://cdn.sqhk.co/poronujefino/iiihjf0/solikube.pdf
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/sotizepeliper-demamoluloxo.pdf
    • http://helplnstagram-confirm.com/519333372883esnx.pdf
    • http://agent-ritual495.online/his_dark_materials_torrenta41g3.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/3498197.pdf
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/bf87dc869a4.pdf
    • http://maluxevuno.22web.org/36930532176.pdf
    • https://cdn.sqhk.co/gepumenujeme/iihghdZ/new_ufc_news_youtube.pdf
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/jemagelepasofug.pdf
    • https://cdn.sqhk.co/xovenekot/UKhdfia/zolenikesozimurulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godewumazek/xepunuve.pdf
    • https://s3.amazonaws.com/xapidajovaji/77587351335.pdf
    • https://s3.amazonaws.com/bolovopizonuki/tuxonot.pdf
    • http://mafixatoje.epizy.com/bts_all_music_video_free.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_ca222d534a4f44519bbd8da597b59fed.pdf?index=true
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_24c05641992e43ab97366cc382c74a94.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_5b6ad05e8e6d439ca8087b339b4cd26b.pdf?index=true
    • http://xabiworaw.epizy.com/97830901884.pdf
    • http://rekewam.rf.gd/how_much_do_managers_at_planet_fitness_make.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_a731d605f74b42ac871c8d65908bf01d.pdf?index=true
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_809cac3f476440b0aaf1142512c75bde.pdf?index=true
    • 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_off0000d6bd.bin
7072df983243aac915ee6d4cb356c6dbad7ca4a49a585ed131475a7329ec83c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 5068 bytes
font_01_sfnt_off0000e7f2.bin
46761572f976bd271d94e6010848a0825227a2f8ea1dffc373484318f606f62a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 10544 bytes

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