Malicious PDF — malware analysis report

Static analysis result for SHA-256 7628e2a2bf8132bd…

MALICIOUS

PDF

73.9 KB Created: 2021-02-16 22:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ee0cd530bf4b83a127ae3a0e9bd006a7 SHA-1: d743032d128a1d47258426488ca4c1c336528002 SHA-256: 7628e2a2bf8132bdd8d8fe7bb08ee4192979b64905044af05ceeec7cd4068ac3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'fios wifi not working', suggesting a pretext for the embedded links. The PDF contains numerous external URIs, many hosted on disposable domains, which are characteristic of phishing campaigns aiming to redirect users to malicious sites. The primary malicious URL identified is https://leonvi.ru/strik?utm_term=why+is+my+fios+wifi+not+working.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://leonvi.ru/strik?utm_term=why+is+my+fios+wifi+not+working PDF link annotation
    • https://wemovimezatura.weebly.com/uploads/1/3/4/6/134611727/d05ad63256df.pdfIn PDF document text
    • http://rivezetufizi.iblogger.org/chamelephon_apk_for_mtk.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/iAmtsKT/49227526753.pdfIn PDF document text
    • http://kilobowomix.22web.org/kizelazu.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/njeumib/gowopofomugon.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/tix2Ahi/best_turkish_ringtones_2020.pdfIn PDF document text
    • http://risopik.22web.org/what_was_the_congressional_reconstruction_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/yjcheih/xijugomerugubedowitijabo.pdfIn PDF document text
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/ramuwefimotiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulalanetoki.epizy.com/google_sheets_if_then.pdfIn PDF document text
    • http://tifalupu.rf.gd/jivanijolevuli.pdfIn PDF document text
    • http://dojirezanis.epizy.com/report_fly_tipping_darwen.pdfIn PDF document text
    • http://sidiwen.epizy.com/family_worksheet_esl.pdfIn PDF document text
    • http://vujoponax.epizy.com/tipumifigerowalosu.pdfIn PDF document text
    • http://vaxomuterok.epizy.com/amu_11th_entrance_form_last_date.pdfIn PDF document text
    • http://dovovefuwaxav.epizy.com/gopimilanezetux.pdfIn PDF document text
    • http://tefokubekaxo.rf.gd/boylesports_bet_tracker_android.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_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 5208 bytes
SHA-256: 2391910eddea8f88ed5c1058b41c7953c64c6ef7936fa76ae2caeec40c80c0a9
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10456 bytes
SHA-256: 66740a821ae7ddf594cdde513a39f522651bc6a5af8521e9ab78eb89b9941a0b

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