Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70ee323d15d3785…

MALICIOUS

PDF

106.4 KB Created: 2021-03-17 05:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8498271d4e4c21664d5befd9f27814d6 SHA-1: 2e97047298f374f811981224ffac2c6e33cafa98 SHA-256: d70ee323d15d3785153aca98f88583e4a9412a623c96f3d715cce0c5b5948177
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=cell+growth+and+differentiation+pdf PDF link annotation
    • http://worelimupuvefam.mywebcommunity.org/what_is_health_psychology_course.pdfIn PDF document text
    • http://mstmail.space/armor_of_god_priscilla_shirer_free_downloadh7xfx.pdfIn PDF document text
    • http://servicesforsupport.com/el_ambiente_laboraldos3l.pdfIn PDF document text
    • https://dobabolomibela.weebly.com/uploads/1/3/2/6/132681713/fogusenasenijurub.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/john_deere_x320_48_inch_deck_blades.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/mesubufekaduwixofa.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/153208891d.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/2d130a288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_5fcdadde27114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fe41f44d7118.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/31914403860.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/nakezed.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/cambridge_primary_mathematics_4.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/guzuwujaxijawefuxejebavur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_602ba7f86f605.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/konsep_pluralisme_agama.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/what_channel_is_peoples_choice_awards_on_xfinity.pdfIn PDF document text
    • https://rezezeveg.weebly.com/uploads/1/3/1/8/131871466/tibafid.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/the_squat_bible_download.pdfIn PDF document text
    • http://leludezoz.scienceontheweb.net/sodatewokibazujifoliwa.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/schizoaffective_disorder_bipolar_type.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5ff4e0bce271b.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/sivedulatifofojeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://intl-cgd.aacrjournals.orgIn 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_off000161d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D6 5124 bytes
SHA-256: 40331e55af4726852fa90a678ca5bbfeafa86ebf9a03feec9ad3b353a1acec13
font_01_sfnt_off0001734c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1734C 11988 bytes
SHA-256: 6099767dc495c727f85a83f5a386b604322dbed7a2dc8e14640f8bdca99d128a

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