Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef02ff59a800e8be…

MALICIOUS

PDF

133.4 KB Created: 2021-03-27 13:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f759c02330d13d782855b59dc041cb43 SHA-1: 57d27247f0bfd2c62f90dcbf65f050fdd5f96978 SHA-256: ef02ff59a800e8be7773c0669b96544539fd3c9c6cbdbf80d1544917c3b3241a
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 0.9989

Heuristics 6

  • 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 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://dafemum.ru/strik?utm_term=unfettered+meaning+in+malayalam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602f38186c211.pdfIn PDF document text
    • http://ledimpress.biz/cant_change_channels_with_samsung_remotejbpxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_600c79cba078d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_6012992fba8e9.pdfIn PDF document text
    • https://zomipawir.weebly.com/uploads/1/3/4/8/134899005/2b0b30a33e0e49.pdfIn PDF document text
    • http://sandwichhq.club/17613337380l2j9y.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/wopixamanare_lesatora_xejifepezi.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/6258191.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/pQQjHIk/99018975625.pdfIn PDF document text
    • https://jowopuvuramikir.weebly.com/uploads/1/3/5/3/135313070/zuweroz-vezulat-dunanodu.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/borulij_gibexa.pdfIn PDF document text
    • http://stopnutristrike.ru/fitogvi57s.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/Nrif8mF/science_lab_table_clipart.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/igcnMhn/ramadan_calendar_2019_pakistan_lahore.pdfIn PDF document text
    • http://rent-nout.site/vatadunijukonedanufusupod73vne.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/dKDgigj/valorant_first_strike_qualifiers_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/cgcV3DI/break_down_someone_s_walls_meaning.pdfIn PDF document text
    • https://romidawuro.weebly.com/uploads/1/3/2/7/132712233/bajemiporefuzajol.pdfIn PDF document text
    • http://smartline58.ru/archive_25_albumh7v5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414514/normal_5fdd7713a32f1.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/9107003.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://gitlab.com/smc/meera/blob/master/COPYINGIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000176c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x176C7 28212 bytes
SHA-256: a47fdb396278a52abe71d7d020937811a1cd9fdfae31f4bbb851e379f0813631
font_00_sfnt_off00016561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16561 5144 bytes
SHA-256: cef72dcd1950f150dc844d5fa6cd6818a0a67258ccd0077498ba987f4d1ca32f
font_02_sfnt_off0001c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6FB 12564 bytes
SHA-256: 05719041d7069ebf9b11a2e6d91732a38ba87202e076c83c8cb0b08e9edc7bfb
font_03_sfnt_off0001f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0CF 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61