Malicious PDF — malware analysis report

Static analysis result for SHA-256 239fb05b87840cef…

MALICIOUS

PDF

82.7 KB Created: 2021-02-16 00:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 213df75981fc514bab599860ef8e141c SHA-1: f356fc1b8a1d9cb8560ba0a8d588d8cf7c24fa74 SHA-256: 239fb05b87840cef4c3cf1283f28ec7d87ef3bff1e27faaae355d4621a0e7700
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically highlighted as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=kate+chopin+at+the+cadian+ball+audiobook In PDF document text
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/rikorekowekubosisur.pdfIn PDF document text
    • https://cdn.sqhk.co/nilajinipur/EzahaAV/clue_game_characters_weapons_and_rooms.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/db9d9c.pdfIn PDF document text
    • https://xugugizebe.weebly.com/uploads/1/3/1/4/131482894/1044317.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/3650270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekelogamaju.rf.gd/bexatirokizitoponowerari.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/41017686047.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/37088504632.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/nelef.pdfIn PDF document text
    • http://wamoxavetemus.epizy.com/kabhi_alvida_naa_kehna_3gp_video.pdfIn PDF document text
    • http://mowigefugitixa.epizy.com/inverse_trigonometric_ratios_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/breast_cancer_screening_guidelines_nhs.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/balkar_ankhila_new_album_song.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/fetexuve.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/vinimotovesareta.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/76113781911.pdfIn PDF document text
    • http://semisoriguregix.epizy.com/98988783692.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/phases_of_cell_cycle_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/bongo_music_sites.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_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 5060 bytes
SHA-256: 9a65cf9be9639b96d0f33d6e80b675297e459d2f0fac408b5cee3e812f010a0f
font_01_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 10208 bytes
SHA-256: 8b82ad000e604b8b7ea846fac52d191f3b0b99852f7624e6c7d4b652e6220a65

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