Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc824ba14318caea…

MALICIOUS

PDF

103.0 KB Created: 2021-04-02 20:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff6dea2fcfce5b724655dffe09a8f6fd SHA-1: dade1b0f3eca8d5f63575dbbfadbe623df1dd0ad SHA-256: bc824ba14318caea7718848fa2295d0612aa94fb49ec7516956eb5bb3599a0fb
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to known malicious redirectors and link farms. The document body, though heavily obfuscated, appears to be a lure related to 'Sinhala adara nisadas'. The primary function seems to be directing users to external, potentially malicious, content. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/123?utm_term=sinhala+adara+nisadas In PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/somukuwesojipavo.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/nejoxakofabizur-raloxezi-minaxedebizab-duxanan.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/koluwawok-jabefave-buxemitezoromod.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/5587874.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/4710432.pdfIn PDF document text
    • http://mirror-x.org/tarubizameneget2kgvo.pdfIn PDF document text
    • https://tarutugiwom.weebly.com/uploads/1/3/5/3/135326066/3040258.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/kotifiwaxabaxar.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/rezuwexurakoz.pdfIn PDF document text
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/b57f9f8.pdfIn PDF document text
    • http://redita.fun/13233346491i8rx6.pdfIn PDF document text
    • http://nickned.me/53889400290dx12a.pdfIn PDF document text
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/8ed8d2.pdfIn PDF document text
    • http://afracheat3.xyz/234267776902dxn7.pdfIn PDF document text
    • http://liketime.online/krishna_ji_ki_bansuri_ringtonenh2og.pdfIn PDF document text
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/4133c0e21b36fc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_92ddd350a2f545e2968fd0050d1962a0.pdf?index=trueIn PDF document text
    • http://xesidif.epizy.com/kufebezabi.pdfIn PDF document text
    • http://fefuvorezikoko.epizy.com/69773163850.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_b8b672124542463faf0812615611b85d.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_09cbb6d82d344e268b275499ee7b0c24.pdf?index=trueIn PDF document text
    • http://punipovudipani.rf.gd/62103030867.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 5016 bytes
SHA-256: 75dc5159941deec9cf52c5e69b565bdd238fb8d64e52960184ec6a8dc0936f2c
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 38368 bytes
SHA-256: 471adab262126a76ff5b89f292de2b44889a01e313958e00bd694f01884d9e48
font_02_sfnt_off000155e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E2 10172 bytes
SHA-256: ba64f9f721747d18b938fc4b34ef0f46e03c8adb54bd21c6222f16a5351da605
font_03_sfnt_off000178ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178EF 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994

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