Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c78c6a8e1e29de…

MALICIOUS

PDF

112.3 KB Created: 2021-03-01 12:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a700131c81a4e25a542476f3dc51738a SHA-1: 5903873cb11452a88a5fec932e8066936738e18c SHA-256: 87c78c6a8e1e29dee7bbac73788b9ab7c379759f82cb45467acfa85ef02d74b3
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/123?utm_term=1976+cessna+182+service+manual PDF link annotation
    • http://datulosuwila.iblogger.org/mimomazineki.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/vizio_e420i-a0_power_board.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/mojipufiwiwexas_nakojaxajitejo_rotagi_kividuto.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/menunigininabo.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/happy_birthday_quotes_images.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/the_postman_always_rings_twice_character_analysis.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/thomas_troward_dore_lectures.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufizup.rf.gd/57978659449.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/how_to_start_a_boiler_from_cold_condition.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/environmental_impact_assessment_template_australia.pdfIn PDF document text
    • http://molojagevatabu.rf.gd/cyberpunk_2077_release_time_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/54660012166.pdfIn PDF document text
    • http://vebuluxuj.rf.gd/33667119606.pdfIn PDF document text
    • http://wajines.rf.gd/xefojuduwuxi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 13032 bytes
SHA-256: b6f6f8c7f220128cf328942d2367142f1794b0c8b5c29fac08a01eb4557e1277
font_01_sfnt_off00014a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5F 5680 bytes
SHA-256: ae31f2ff1c63f97572e9516e2b1d27486538ad716274e7429b264991efc7ebea
font_02_sfnt_off00015d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9E 14060 bytes
SHA-256: 4f344d6d18f5e8cb2ab1ab14d3bcf6491189170a90de4373b410da47b2bece76
font_03_sfnt_off00018cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CBE 16684 bytes
SHA-256: 7e2a3f3df37796ab3caf31e9d8d0a0b1536d9999f5f260597c1d3a5629525efe
font_04_sfnt_off0001a3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F2 6156 bytes
SHA-256: ce70e61426e2f390b87f568f1aefc80fbd40c7610672a0a16f8c916cfab76ea8