Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f6afb4f644a10…

MALICIOUS

PDF

115.2 KB Created: 2021-04-05 07:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 84aac6809d68eeeea994d2d3a89dfdff SHA-1: 11f6c27b127b06dc91c4defa09be2337eb2040f4 SHA-256: 4b8f6afb4f644a10eb19cfbbd52704a940c16d56333fc0f7f623533a0b0d3567
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm designed to artificially boost search engine rankings for specific keywords. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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=art+as+therapy+alain+de+botton+free+pdf In PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/riwikidevep-gexixexokonufe-lilodezopeba-dofosabokasax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_600d64ff9c582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5ffad9404c860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6012baf1b35ee.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/8793434.pdfIn PDF document text
    • http://wozonos.22web.org/tatexabovotasujoriwed.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/xiwumimolozatow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_6006bc542b00d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_60286d4e51cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_601a31c61a430.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/ccna_routing_and_switching_200-_125.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/nawawi.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/ajay_kumar_singh_english_book.pdfIn PDF document text
    • http://govatojajij.epizy.com/c_v_v_ka_full_form.pdfIn PDF document text
    • http://robirevi.epizy.com/anlage_av_er_2020.pdfIn PDF document text
    • http://balazetesu.epizy.com/boring_but_big_program_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/sebunifadakolufoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/russian_cursive_practice_sheet.pdfIn PDF document text
    • http://dabemekos.epizy.com/57023492135.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/acrobat_reader_pro_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 7000 bytes
SHA-256: 91542a26dc2406ca27854d0a20a2d0c644446da9b673f587ffe221283cdb7f6c
font_01_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 3812 bytes
SHA-256: de1d29cbd3266b333fb9904e30aa9d7a403c524d51449b312d4a83acba6582c8
font_02_sfnt_off000135e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 1796 bytes
SHA-256: ec0f9acce1c2ac974623f96f4e1a642f5d245a5165c0398e79a7c9e6b11a534d
font_03_sfnt_off00013eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAC 5360 bytes
SHA-256: 7478e3fa9b6bfa3adc6e51294f6daad6acb772a4b397660f98ea9bb09ea20512
font_04_sfnt_off000150e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E3 20212 bytes
SHA-256: f0650570521df21c5835c04dfb062429d1948512bade4b89630f7eb4842b74cb
font_05_sfnt_off00018c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C67 16396 bytes
SHA-256: 339ed02e8c8293d8576201ea053b87c79790f25891ed6876d799643fdc149aef
font_06_sfnt_off0001a2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B8 3512 bytes
SHA-256: 3e7ea9804d69d4e8b126fabf50d1335c7b280abbc1b2e07f7019e0b7e2580368
font_07_sfnt_off0001ad9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD9D 6052 bytes
SHA-256: e3e86ee76bd95d3399dbcc42e729df157d856f7ebad32d7c8dadb9c82ff05e61

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