Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9789379ba819258…

MALICIOUS

PDF

113.7 KB Created: 2021-03-30 00:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0949a6af8429566cd15fc76bfa27e4b9 SHA-1: 98c5f28addee066b7aa7afd4f3a61b89bc5ae58f SHA-256: d9789379ba819258236a9af06788eb53c969aebb4c30323a3b7ba0edfdf6d484
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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 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/award?keyword=sri+rudram+chamakam+in+kannada+pdf In PDF document text
    • http://zonojebiridizo.mywebcommunity.org/download_dictionary_english_to_farsi.pdfIn PDF document text
    • http://desokore.medianewsonline.com/79017744314.pdfIn PDF document text
    • http://julapekawej.22web.org/savagozazenaro.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/jfhcidQ/bitibesivode.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/basic_grammar_placement_test.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/KjdqOie/real_drift_car_racing_full_apk_ultima_version.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/PBjfhfP/3_doors_down_away_from_the_sun_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/E9jh9hb/14141347294.pdfIn PDF document text
    • http://loxalidigitoja.iblogger.org/vak_learning_styles.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwomuf.rf.gd/bose_qc35_ii_firmware.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_9e1a86674cd345e298350b4810b2f2b7.pdf?index=trueIn PDF document text
    • http://nexizali.epizy.com/dobaluwatobubewil.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/easy_baroque_pieces_for_classical_guitar.pdfIn PDF document text
    • http://numorajigot.epizy.com/who_were_the_viking_gods_ks2.pdfIn PDF document text
    • http://wukezize.rf.gd/how_to_clean_a_hoover_spinscrub_50.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_001f79e3c2e94445863acf828f8818fc.pdf?index=trueIn PDF document text
    • http://widenipana.epizy.com/biblia_paralela_ingles_espaol.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_a1080dee50434c8497319ef792ac2fcb.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_2db168d423d04e62990bd43eb3b0556c.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_ab87de7146434c8e9f8b3cc205eb531a.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_7214f1b075f44c21b931f7ffa9adc314.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014821.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14821 46052 bytes
SHA-256: 8ff2645ec742dc3ba3e44817e93c390bc035914e5f3350acbe5a6f9361afb61e
font_00_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 5352 bytes
SHA-256: 10f7bfb1f9b81f976cec8ca036ca70e8c35fa46619f0b1439b5bb046e613b915
font_01_sfnt_off00013eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAF 2140 bytes
SHA-256: 6d8ba269b6cd4051458871b1c8b8274f188851dd9988bcb1489c18fe10044ea1
font_03_sfnt_off0001940d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1940D 10200 bytes
SHA-256: 5930bb9799b1ce708286cdd1da7b440d5c24d76e0387ff143932ce2f2fd70026