Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbd649be5f83d2d…

MALICIOUS

PDF

86.8 KB Created: 2021-03-14 03:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f00834c0c1d5befd7f8a2daf721ca09a SHA-1: b8a7b7246a97da3f8557b5c38920080f327e5209 SHA-256: cbbd649be5f83d2d784e15b172064c696579ad705e9cc1c9c4159b2cd2e9cb32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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 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://botokaw.ru/award?keyword=4+digit+addition+word+problems+pdf PDF link annotation
    • http://artistichomesolutions.com/how_do_i_program_my_rc66rx_remote_to_receiverevqs6.pdfIn PDF document text
    • http://xojakipizixa.22web.org/microbial_contamination_of_water.pdfIn PDF document text
    • http://komarovskii.xyz/17155491747c9ylo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b8e42f64-dc37-4a6e-8ee8-090eef4494cc/gadedesij.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_3510c6fe49204177a9a69dc5b3abc8ab.pdf?index=trueIn PDF document text
    • http://rezafenunuritem.epizy.com/nikufabuturu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dddf0418-fbf8-45c8-b26b-d765efffa87b/greek_tragedy_antigone_ismene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a619104-0b32-4f2f-9fd4-02998dbc7d48/how_much_does_a_heating_and_air_conditioning_technician_make_a_year.pdfIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_d555bdc8ccd34144af01819fa38a44ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63bdb57-4fd2-4067-aa19-8fbcfc756872/bakimumixosejezoj.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_9f434e9e4f1e4b7fbb598c47080a546c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17701ee0-2f34-4eb8-ab96-47dea7a4caed/jufet.pdfIn PDF document text
    • http://fereralud.epizy.com/vezijotexodaw.pdfIn PDF document text
    • http://dolawiwabipaz.epizy.com/35895749895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1cb36e-d375-4020-adcf-e8baeb3ced3e/murematedeseduz.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_068891033d2a49f2aa579dc5d7b3e6dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7154e3a7-daac-4553-ab0b-110e4d848430/xivewibulevisijizixozuwe.pdfIn PDF document text
    • http://gemixeferakin.rf.gd/pomodoro_technique.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_2b52eede8fbc4d7e8fc8bdfc88422cc6.pdf?index=trueIn PDF document text
    • http://famowasaj.epizy.com/34706766209.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5372 bytes
SHA-256: a3e52089de6886613ff31c51ef7d9ada37b9e316998848e051e07dc953764a76
font_02_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 4424 bytes
SHA-256: 8682bd3117ceab901421ba388c2305982cecd4bcd3ac324e2a33182fc6bd0570
font_03_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 10356 bytes
SHA-256: f19d8c975a8c6d89195d3ac05a56a02c5381b3c4020d8313bcc127110fb21873
font_04_sfnt_off00013d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378