Malicious PDF — malware analysis report

Static analysis result for SHA-256 8683fb7113baa973…

MALICIOUS

PDF

75.3 KB Created: 2021-04-03 03:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f26c81279f416d57432e1547c32118 SHA-1: c7334f0c7c9eb534529323ac9a2aa3838e63be79 SHA-256: 8683fb7113baa973d842779a9ab7bd7e2a2386c6ac843897f5d6895fe6b4e0d6
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 of which are to link farms, indicating a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=radio+flyer+tricycle+4+in+1+manual
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/menibipipibabel-lafadesoxanowor-nawirixinabasow-xisuzivab.pdf
    • http://xonesasa.iblogger.org/apple_certification_system_login.pdf
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/3c0a43.pdf
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/keronuguro-wibotad-ruvibo-tizebedoru.pdf
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/rutesivizininip.pdf
    • http://fizarumokugafu.mywebcommunity.org/22250449323.pdf
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/5878447.pdf
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/gazur.pdf
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/podulutovin-zogero-mosizo-sosujig.pdf
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/df47266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_d67c36dbc7954dc4bcf98cb69b29ab61.pdf?index=true
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_9e4f9a65aa064233af7f0bca0515ef4b.pdf?index=true
    • http://pedirite.onlinewebshop.net/download_medical_science_dictionary.pdf
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_07ed64d311294ffdb27d405ce6666e13.pdf?index=true
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_fd8f4e0ec65648b182e06d5374a9a7f0.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_5eb807e9b56649a19da5ed57853cfa27.pdf?index=true
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_2fa3b855e63342a38e5741de02e803bb.pdf?index=true
    • http://fajenadiwizowo.atwebpages.com/white_out_look_meaning_in_bengali.pdf
    • http://tinafominur.epizy.com/ovulation_calendar_free_full_version.pdf
    • http://zakuvusebaj.epizy.com/12662836000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72d.bin
6ecdb94025fd2b2549fbec50f94e075ac4121ef04e83eb70d46bc8d14b32436c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 5120 bytes
font_01_sfnt_off0000e88f.bin
220ee87afd075422b2816638216462126b645ff7b4cb83732764f0d0130b6359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11936 bytes
font_02_sfnt_off00011010.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 4324 bytes

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