Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4db487b9b1e764…

MALICIOUS

PDF

79.8 KB Created: 2021-03-25 16:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 890d8ca659da83b1b10a6933b8b9c12a SHA-1: d8fd33892d83813fdb172a307c3a46d672758c68 SHA-256: 6b4db487b9b1e7648dc3165ea056ffa658ae2602b3aadf7b525724712a3fd7df
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to 'advanced materials notes pdf'. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=advanced+materials+notes+pdf PDF link annotation
    • http://fofolep.mywebcommunity.org/mini_football_pitch_dimensions_in_metres.pdfIn PDF document text
    • http://tryplafond.xyz/21460455861l3wkt.pdfIn PDF document text
    • http://vuwulaviwu.iblogger.org/4424509855.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/do_pellet_stoves_have_battery_backup.pdfIn PDF document text
    • http://helpcopyright-service.com/wordpress_download_page_as_plugin3uqle.pdfIn PDF document text
    • http://hyipinvest.site/lododura4yh65.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/kaganema.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/bass_scales_chords_and_arpeggios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamonoxo.onlinewebshop.net/24167170742.pdfIn PDF document text
    • http://fibedul.rf.gd/ripamafejumabidaxigix.pdfIn PDF document text
    • http://kufutajov.epizy.com/wejinudofuwoxulukafo.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/60972745616.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_57ecd62cfa8542198b8b413af1eb3bae.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_21b38f49cd5846a0ae6f9a86912251f1.pdf?index=trueIn PDF document text
    • http://pitalonefizat.rf.gd/jepelebiwakejul.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_a68c21f5f49a4a14a90cee530df071c8.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_658be831c2c443b5ab9494dbd7ad9e0f.pdf?index=trueIn PDF document text
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_0af90ec1fc174bd986bdaf43db7d84c1.pdf?index=trueIn PDF document text
    • http://rotamamum.epizy.com/firewall_palo_alto.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/how_to_reset_black_and_decker_bread_maker.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_62d1fd30003045fc9bcb280a89d832c6.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_e8f9214cf1cb499492d6951087fd0c10.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_c01433531c604e6084d37da4a7f39e8f.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_75e6e885a2754daf951d5165592135fc.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 5352 bytes
SHA-256: 4ca4ac4f8e122d81c6257989d0378b1d368ade6c421e410969f06e70585b58c7
font_01_sfnt_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 12036 bytes
SHA-256: 615b2b92741e49f56d93895ff0a82f8f0f0726009df5c6da8997450fc9450bd7
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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