Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8e7feeb6af32fe…

MALICIOUS

PDF

80.4 KB Created: 2021-04-01 04:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960ab9ff471e28f860eee750f0453c8b SHA-1: aadbbb1f0467ce13728ff1f22007fadf044e2d6d SHA-256: 1b8e7feeb6af32fe066fe149a85a02a069e136f9b6f518a947f473f1f4663b15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or link-farming attack. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/aws?utm_term=motorola+g6+phone+size
    • http://rafale.store/george_foreman_grill_temperature_chart4jyfc.pdf
    • https://cdn.sqhk.co/tedubifo/ivhgidy/selesagoxurawiwojozan.pdf
    • https://cdn.sqhk.co/rujiwujik/jJ21jaE/exodus_movie_streaming.pdf
    • https://cdn.sqhk.co/sileluzorupo/XBLC6gd/fipivanizi.pdf
    • https://cdn.sqhk.co/gewowamizes/gjhheje/shooter_mcgavin_costume.pdf
    • https://cdn.sqhk.co/goxobuve/fsmBDgd/minecraft_pixel_art_ideas.pdf
    • http://lokotahas.ru/zesunesigf0p2i.pdf
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/5902919.pdf
    • https://cdn.sqhk.co/dufubimaru/gjguxw7/41895693154.pdf
    • https://cdn.sqhk.co/musutalivun/P5dgiYe/6785502776.pdf
    • http://kamaz-ftc.com/C3BCC3A7_dC3B6rt_beC59F_yayC4B1nlarC4B1_ygs_matematik_soru_bankasC4B1_indirwppjs.pdf
    • https://cdn.sqhk.co/gabadifofibo/amjhmij/self_guided_walking_tours_of_paris.pdf
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/vakilidutajuta-sukopibofar-neziri-xexixub.pdf
    • https://cdn.sqhk.co/pusuvizodez/miatiah/nejodowizuzupupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_72cbd706348b4be09cee9506edb21c86.pdf?index=true
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_6064014515204dd5a5cd407dde23f761.pdf?index=true
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_be31aadc91ba4d059244506f4f54c4be.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fa.bin
f5768a1137ceadf46cc6732043e4744dd8081086187296ca949e2d5ef835ee45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5288 bytes
font_01_sfnt_off0000f6fc.bin
776bf8e36d86312beac71b7158151eb9782e920e2be1273932e34437b6197e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 11700 bytes
font_02_sfnt_off00011f03.bin
e208e0cadce107deb38877b1a3532331b995bc19305c456ae9b5b3f20ae95a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16244 bytes

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