Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f78de154d134157…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 09:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6fa981a4f27843ad3336f8466b9f03e SHA-1: b3431edb4806a0799f955a825bdebeb3e4ee8477 SHA-256: 8f78de154d134157ca190665295d6fb1b80f43d4c4f9e7657feeb5248803dc26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://seumenha.ru/wix?keyword=see+it+bigger+pocket+planner+2020 PDF link annotation
    • http://sutiboju.sportsontheweb.net/tuwefukagapapatujirefow.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/1333135.pdfIn PDF document text
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/sorodumob-rezokufin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_601bb788b89c6.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/basel_ii_deutsch.pdfIn PDF document text
    • http://vivebax.iblogger.org/what_are_newtons_3_laws_simplified.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_6022b4bdb4842.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/2381756.pdfIn PDF document text
    • http://papopeputato.iblogger.org/ratios_and_proportional_reasoning_course_2_chapter_1.pdfIn PDF document text
    • https://jejavogizapivi.weebly.com/uploads/1/3/5/3/135388932/bazurex.pdfIn PDF document text
    • http://callipakk2.site/wikakuzelowefenesuahhy3.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/zadekos3yfvv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/gudotimejo.pdfIn PDF document text
    • http://revodez.myartsonline.com/pupiserapeluwedefevox.pdfIn PDF document text
    • http://votuvut.epizy.com/9614489074.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/ponudivarusu.pdfIn PDF document text
    • http://nofolimuri.myartsonline.com/tumaczenie_zda_z_polskiego_na_angielski_wiczenia.pdfIn PDF document text
    • http://tazodeb.epizy.com/xevidamorajunobimukonon.pdfIn PDF document text
    • http://tirejazanapo.epizy.com/koberizelalixulenelejodoz.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/kezoviguradonopuvojevi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 5504 bytes
SHA-256: 81d0c7195fe469fe085466a2136ca8d9fe1d597abf5a1732457262b968da192c
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11088 bytes
SHA-256: b2cff211b092f785c84332969fa55122c701f347deb80919cbac9829d2201209