Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fc589f4d1d272c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 14:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b34980b8dbc365fe95bfd80cac69a2d SHA-1: b71832fe010aa84754c8a4777e3780796b3621eb SHA-256: b6fc589f4d1d272c3a87bbc0686f91681cfab5223a2f345e1d8d534c16f152c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The primary malicious URL, 'https://bologen.ru/strik?utm_term=how+many+carbs+does+arby%2527s+horsey+sauce+have', is presented in a way that mimics a search result, aiming to trick the user into clicking it. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

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://bologen.ru/strik?utm_term=how+many+carbs+does+arby%2527s+horsey+sauce+have PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fe5647a3e419.pdfIn PDF document text
    • http://laura-egorova.ru/u-net_convolutional_networks_for_biomedical_image_segmentationh14h2.pdfIn PDF document text
    • http://cetapp.xyz/comptia_a_220-901_and_220-902_expirationtdidz.pdfIn PDF document text
    • http://disclosures.space/43342864724z0i4d.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/dasinakidobobijexos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ffa6c53b85d9.pdfIn PDF document text
    • http://6gusevshop.website/cintas_used_uniforms_for_salesgc9f.pdfIn PDF document text
    • http://totalcreditcheck.info/husqvarna_125b_leaf_blower_air_filterovea6.pdfIn PDF document text
    • http://hookup756.fun/531636951605e3ei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60418e6e6a278.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/10537769864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabamad.epizy.com/wotigavewufotezilojuti.pdfIn PDF document text
    • http://paxexij.rf.gd/clayden_organic_chemistry_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d091ed25-543d-460e-9ef2-36e308596174/christian_devotional_books_for_married_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ac80f1-7ea5-4d58-aec7-fd9fa3c695ba/how_to_use_a_magic_chef_propane_oven.pdfIn PDF document text
    • http://pedijuwugeta.rf.gd/which_term_does_not_belong_ischium_scapula_ilium_pubis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20af43f4-d795-466b-9a42-a1799214c6d4/power_pressure_cooker_xl_vegetable_soup_recipes.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/fotawofabut.pdfIn PDF document text
    • http://wefukuw.epizy.com/gutinoduriluxaraderoxuveg.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/o_cavaleiro_das_trevas_hq.pdfIn PDF document text
    • http://koxolavomuzo.myartsonline.com/4687866400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308a3c20-9318-4478-b872-cbb72a228804/24741288474.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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 5536 bytes
SHA-256: 812edc7b5740f5e82217fa40f282d479777cd89885a929e8674e81ea0f1d7278
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 11812 bytes
SHA-256: 5b2566f4e473884e750577f6cbb8158ef8c30598b0739026a652508896cc4770

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