Malicious PDF — malware analysis report

Static analysis result for SHA-256 049a7b2696947e33…

MALICIOUS

PDF

76.4 KB Created: 2021-02-10 15:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17a5417174cf98d0b7eb4631141f9031 SHA-1: 278ff619f3eba79a634fd827f35104ee283c414c SHA-256: 049a7b2696947e336fad000abc9009611b04ef9dabcee3dae13cfb24a4187477
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, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Uta fafsa disbursement' and the authoring application 'wkhtmltopdf', suggesting a lure related to financial aid. The presence of numerous external URIs, including one pointing to 'baarspo.ru', indicates an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=uta+fafsa+disbursement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5ff3a89d29c27.pdfIn PDF document text
    • https://dejewetekexofig.weebly.com/uploads/1/3/0/7/130775583/rojojenagulenub.pdfIn PDF document text
    • https://vuwawirekexaz.weebly.com/uploads/1/3/0/9/130969699/veguginowuz.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/961dbecca8f2e.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/noditasurapobekebenoboma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5fde73778e302.pdfIn PDF document text
    • http://getne.xyz/17702348412fegxj.pdfIn PDF document text
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/1bf8e09de7.pdfIn PDF document text
    • http://chunyoo.com/willingness_letter_format_to_continue_the_jobnrs1z.pdfIn PDF document text
    • http://yatvoyya.fun/the_mister_download_freep84ar.pdfIn PDF document text
    • http://gufutaca5.xyz/6678647901173j2y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_6003d110900d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6010c7f05581d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://supegawezokex.epizy.com/latest_couple_pic.pdfIn PDF document text
    • http://tidefos.epizy.com/dimensional_analysis_review_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/bsc_nursing_form_date_2018_in_rajasthan.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/ropufukezefovoxokez.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/tadeberazonenovi.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/better_twitch_tv_emotes_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/causes_of_unemployment_in_malaysia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 4924 bytes
SHA-256: bd7f1ea4e0016a92e3cb1336eb67da867b86d592cb0c52d70c98b361aea56b7f
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10464 bytes
SHA-256: 151af3805335a77c24b7dc88657af515d1c45fbc0b454ad651ced6db968f2cb1
font_02_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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