Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb457709d67f0d45…

MALICIOUS

PDF

93.8 KB Created: 2021-03-10 23:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: adb22b018ed0b6165e0b4b9b31365c08 SHA-1: 97b8a20c94148a89d3b1b9e0b7cdd160233052cd SHA-256: bb457709d67f0d45c4615ad832443e3e4e8cb9a39af2924b80a48b99c908e5ec
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 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=ganesha+atharvashirsha+pdf PDF link annotation
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/4330075.pdfIn PDF document text
    • http://carins.info/6998228468o2u4l.pdfIn PDF document text
    • http://regse.website/escribir_para_comunicar_ideas_pensamientos_y_sentimientosqwxip.pdfIn PDF document text
    • http://nuveclovet.xyz/28306055705gjfag.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/bofojowewebamo.pdfIn PDF document text
    • http://academic-club.ru/kowimofoi09ol.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/1125573.pdfIn PDF document text
    • http://istlan.space/bijotalusodibupudapugr2p6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_b7808a77883049e6bc82580fec44c1b3.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_db66687d8bc14dccb3c28402a9d827eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbeadfd8-2209-4edc-9243-0ea34b16e436/gorupazopivedik.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_181f3e589fcd47038cfbc3b9ea26029b.pdf?index=trueIn PDF document text
    • http://pibunowawoxi.epizy.com/bromance_full_episodes_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f6265a-941c-4f84-b7e2-f6859efd6d7e/polukisupomuxow.pdfIn PDF document text
    • http://mefufoseza.rf.gd/45738509323.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_c501f490916346a8b78c405279f8231c.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_f2c6a077128c4821bd96f48b197f4b8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db986c2-2e0b-454b-beb8-6c139e3cc548/mujujemagikazagus.pdfIn PDF document text
    • http://xegiseko.epizy.com/47817171816.pdfIn PDF document text
    • http://sedegagagojuwej.epizy.com/69682308879.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_3be10a5e58c44a1c9fcb25abfbf7920c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/953c43f9-d6e3-4365-9285-2b30bfae42aa/78254639671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c3da27-7a09-4637-8a9c-af05d9b6f98d/zimezemutolagonovosukatej.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 5188 bytes
SHA-256: 57f4b29391b70a33fcefecb68d4b9aa034cefdb62789caa737f0e93e81906015
font_01_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 3772 bytes
SHA-256: 9389eabb5da0f7ff5893e499ff791b47d46466a46589dcf6e6727fbd9e34bd63
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 12216 bytes
SHA-256: c72126d517835fa4cb01c34a6f3c7bf2c978dd2464a431ff0adc3c5bf8770dbd
font_03_sfnt_off000144fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 10756 bytes
SHA-256: dcfae3a9a5631185802891a1d8e9d83485571ce61965b39fffbeeb8f6dbd39b9