Malicious PDF — malware analysis report

Static analysis result for SHA-256 b065a9b788562344…

MALICIOUS

PDF

72.3 KB Created: 2021-04-07 22:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3a3427d67754bbbe7ccca5089c26a066 SHA-1: 924ccc017d6f5ef8a10083fe9c3c654e6231da96 SHA-256: b065a9b788562344875690975ec37bd33a82acdb1515f7ce52cfe9b313b42478
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://vilenefex.ru/123?utm_term=world+cup+2018+video+song PDF link annotation
    • http://filfex.ru/how_to_start_pressure_cook_on_instant_pot_duo_nova79ohx.pdfIn PDF document text
    • http://copyrightreports.com/63454464118ccozy.pdfIn PDF document text
    • https://fanevatonalusi.weebly.com/uploads/1/3/1/6/131637928/8214608.pdfIn PDF document text
    • https://fagezatev.weebly.com/uploads/1/3/4/7/134711774/b2ded4cc485c0d0.pdfIn PDF document text
    • http://uscreditreport.info/duminatigikobuwawudsfczq.pdfIn PDF document text
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/3525911.pdfIn PDF document text
    • http://it50save.info/domelukevipugowekeb1ricd.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/labegizifabew_ripodu_linatumofiwat.pdfIn PDF document text
    • https://katibaluzopoxu.weebly.com/uploads/1/3/0/7/130738884/mumanofojitikef_zidusuden.pdfIn PDF document text
    • http://cmbmarketing.agency/rikoji2ud9.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/kawobivurefoxejewe.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/7460520.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/301847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_37798c4f3ca84639ae9258350cfea3fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb583069-44c4-4c6c-b3ec-9292a8c27315/facebook.com_device_inserir_codigo.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_f37fa65cb70b4f4aa86258992897ab7a.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_3a26585ef8a0474ab470ae80bd84e36a.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f4388c45bc8548b2816d3ff15f0dcac4.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_c6e6829ccc74489590f755aec9a796be.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_756b0268d1df48618ca772afd5859e19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26432d1b-bc9f-4f54-8c53-1ed00971af34/63871100706.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 5624 bytes
SHA-256: 1508249cbcfc90120227d24eb31c0c22aeae16abaefb68481eba63397b1700d5
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 10884 bytes
SHA-256: 2ea61e00d0095c744fc91faff9cfe7e67f61dd310ebfe4c61e846882e3da6d93