Malicious PDF — malware analysis report

Static analysis result for SHA-256 059079e0112d98ad…

MALICIOUS

PDF

68.0 KB Created: 2021-03-06 09:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b52e144226eb2a84f00b9054ae7aeeb5 SHA-1: 712fb1a3fd9ba3e2060523015b58c38d055d7bee SHA-256: 059079e0112d98ad928662da7d0f22c8f018db8ad65791d6725fdb9ab1c28a67
186 Risk Score

Malware Insights

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

The file is a PDF that impersonates Facebook to phish for credentials, as indicated by the 'SE_BRAND_CREDENTIAL_PHISH' heuristic. It contains multiple external URIs, including a suspicious one pointing to zajinet.ru, and an abused redirector URL leading to a PDF hosted on weebly.com. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing page or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/8e8f2e79a92fcc.pdf.
  • 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/strik?utm_term=dometic+thermostat+control+board PDF link annotation
    • http://gidujoluj.mypressonline.com/why_is_my_samsung_refrigerator_water_dispenser_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff90163c4ba3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fff0b9515b3b.pdfIn PDF document text
    • http://jixapijojuxev.iblogger.org/66505994123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_603ec6053335a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5ff29aa212482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ffcd03a66d31.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/craftsman_33_gallon_air_compressor.pdfIn PDF document text
    • http://numulul.mygamesonline.org/is_it_bad_to_wake_up_crying_from_a_dream.pdfIn PDF document text
    • https://nebuxulusa.weebly.com/uploads/1/3/5/3/135306634/8e8f2e79a92fcc.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/the_killing_joke_netflix_cast.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/6378256.pdfIn PDF document text
    • http://dowelatevitik.22web.org/types_of_bearing_file.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwasebax.epizy.com/wuxofomavafukomopukan.pdfIn PDF document text
    • http://valogaberel.rf.gd/instagram_account_lschen_handy_android.pdfIn PDF document text
    • http://nuloporime.rf.gd/81538926907.pdfIn PDF document text
    • http://sabozovitebem.rf.gd/kuttyweb_album_songs_starmusiq.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/solving_radical_equations_worksheet_kuta.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_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 5316 bytes
SHA-256: 937294c4ec924860d29f7f6ac7b0013ee3cbc6d26855c29047d2ee6035965969
font_01_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10648 bytes
SHA-256: 78ab8adca16f024fa6cc0a918da6eb32e98d9b9d3ffd871d1b45fa8d5d79b77c

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