Malicious PDF — malware analysis report

Static analysis result for SHA-256 2597acc278a0c0f1…

MALICIOUS

PDF

74.7 KB Created: 2021-05-16 06:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 01754763dd23d11fdce4180880c427b3 SHA-1: 3ca0fec7d0cd19bf652f7829b7f63b2ed1a71bf5 SHA-256: 2597acc278a0c0f1c0af9bc841549617a21501b8372f1649eaa285a6e04434e3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

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
  • 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://nipisod.ru/strik?utm_term=bissell+powersteamer+pro+deluxe PDF link annotation
    • http://xofebuledat.scienceontheweb.net/college_bonafide_certificate_form.pdfIn PDF document text
    • http://gallery-shop.site/aws_data_warehouse_architecturero61y.pdfIn PDF document text
    • http://wide-mean.top/zugutapa9jhbc.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/format_for_employment_certificateiu5oj.pdfIn PDF document text
    • http://topsol.xyz/plantronics_wireless_headset_manual_cs5401uzb1.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/amino_acids_organic_chemistry.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/combiner_plusieurs_en_un_seul_mac.pdfIn PDF document text
    • http://mmuuue.space/why_was_little_house_on_the_prairie_cancelled_on_insp96phs.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/44875986180.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/mrityunjay_kadambari_file_download.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://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_af6cbc34a58a49eb9a19a59968e900ec.pdf?index=trueIn PDF document text
    • http://timodetunidup.epizy.com/mosep.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/how_to_solve_the_volume_of_a_cuboid.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/70764403162.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_871dc2137a234006aaa7da79758a22c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1def99a-b0aa-4aa5-9e89-9ec956bdcbff/sharp_atomic_clock_spc364_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/android_tv_x86_2019.pdfIn PDF document text
    • http://jojajixinoxu.epizy.com/11418646775.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/atmega32a_smd_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ae1404-eee3-497f-977c-2d1a32f13cab/17227479503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264b7e8b-1948-46a9-85af-e16163cb3e1b/black_mens_hairstyles_for_short_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6381cd-5259-4394-8046-dc588feffe9a/83359029474.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_c733e29f19d64559993d3b20a4441617.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5088 bytes
SHA-256: fef9259823f477876d4f5f6261319f1e03d38fbe9be0ff1ae460abdcded79b2d
font_01_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 10844 bytes
SHA-256: 2e5765e26ac1bfdf02e9793b869c4c45bb43e337931f3760755cb27ff1b01cef
font_02_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f