Malicious PDF — malware analysis report

Static analysis result for SHA-256 b034c76eb8cd6cc6…

MALICIOUS

PDF

90.8 KB Created: 2021-03-23 01:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 955f764c5ecf8402204db41c0cf4665c SHA-1: 500efc1503b06ee12372dde354cd2c6edea34d0c SHA-256: b034c76eb8cd6cc61a9283722f4e2eaf77228ecb8b688522084d713f31bb6818
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a primary URL that appears to be a keyword-stuffed link farm. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=hollywood+undead+discography+download+free
    • http://gukabibus.mygamesonline.org/tepisanexirerog.pdf
    • http://canlisohbetim.net/laxizamuvazt60gj.pdf
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/jiwigidimon_mofabunozedusol_nazos_gatevinamewukax.pdf
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/87ee7414.pdf
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5ff069db42cb7.pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602080ce0c9e0.pdf
    • http://tetupamino.mywebcommunity.org/samafoveguzis.pdf
    • http://lewizakadogera.iblogger.org/penny_stocks_to_buy_now_canada_reddit.pdf
    • http://milansit.space/finemapimb0wt9.pdf
    • http://widuzuduzudovix.iblogger.org/wotuvotaripuzuvow.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5fd618e2e49b1.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_6017120dce6e7.pdf
    • http://onenature.space/lista_de_exercicios_sobre_relao_fundamental_da_trigonometria8wbs9.pdf
    • http://tuligofabuwisa.22web.org/arctic_circle_information_rovaniemi.pdf
    • http://waliduv.mypressonline.com/boye_long_loom_set_patterns.pdf
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/lanosifuguwor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wipadafefuxasi.onlinewebshop.net/bacchae_play.pdf
    • https://uploads.strikinglycdn.com/files/eeb3ba93-3265-4747-b16f-349ad16f2603/blank_board_serializer_versions.pdf
    • https://uploads.strikinglycdn.com/files/55855e94-504d-457a-909b-48fbd3a982e5/marketing_management_salary_per_month_in_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/c2f0f0a3-68dd-4a29-8619-62b215029e5b/what_is_an_islamic_caliphate.pdf
    • http://susesibukof.epizy.com/zetadadibebenukasu.pdf
    • http://fowagamop.rf.gd/simple_cost_sheet_example.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012478.bin
2fb95c55720ccbc900ad5df80efef0690c0339c704eca86b3e479d00e69780b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 5572 bytes
font_01_sfnt_off0001377f.bin
f812f7083496fdeb2cd337e400aeff0c6caeb6c5eedc402ace04eba84bb8d3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1377F 11444 bytes

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