Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a832430c764dbb5…

MALICIOUS

PDF

85.2 KB Created: 2021-05-09 07:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c93ee4160f165524f0c7153cf29131d SHA-1: 2b5c55f169777622721a0e1576f3b44f0a718052 SHA-256: 1a832430c764dbb59624712027c66033c62be4023836f49caa1d85edab7fe3bb
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links that redirect to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

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 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.
  • 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/strik?utm_term=gypsy+jazz+chords+all+of+me In PDF document text
    • http://tozemudezajif.mygamesonline.org/sepawoladesokulavijumun.pdfIn PDF document text
    • http://optarfes.com/49143514649bbxli.pdfIn PDF document text
    • http://finonit.mypressonline.com/kakuzebiporizomogoralikil.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/63138520033.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_does_time_and_space_mean_in_a_relationship.pdfIn PDF document text
    • http://fakaluwu.scienceontheweb.net/62232548390.pdfIn PDF document text
    • http://pefipegukanijel.22web.org/champakamala_video_song_free.pdfIn PDF document text
    • http://kihepc.xyz/how_much_is_propresenter_735j8k.pdfIn PDF document text
    • https://dogenirifalalu.weebly.com/uploads/1/3/0/7/130775866/2937910.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/2976868.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/56160680355.pdfIn PDF document text
    • http://nizumewuminal.iblogger.org/social_constructionist_words.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/492e8322-4f8a-473b-a1e3-bb86e1b79eb9/a_jobs_working_set_is_the_collection_of_pages_that_must_be_loaded_from_secondary_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb186197-37a5-4bb4-b3f0-c8956f929f1e/99369175496.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/why_do_my_chords_sound_bad.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/wexaniwiludigi.pdfIn PDF document text
    • http://sonekefe.epizy.com/ateten_gmlek_zet.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/sokixitaluduxuxudegidi.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_off00010ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 5652 bytes
SHA-256: ac614a2d03f118e69a05d82f00da48588a539caf7dd078fd08b7f7086e44089a
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 12868 bytes
SHA-256: cd9395a876f384f4fd43e94cb43eedede09144ce2f4858288d3760662ab529f6

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