Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c99444874616b83…

MALICIOUS

PDF

63.7 KB Created: 2020-12-26 20:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 40ce580dd37a15ee8069f36e220638c3 SHA-1: 53c043ff2a9496b069a6496e35f41e6cda9c86cf SHA-256: 4c99444874616b8377d3100de3c9c50cb1b7ce62079c813ed67b92bd9bc67458
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also contains a link farm of numerous external PDF files, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating a phishing or malware distribution campaign.

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
  • 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://gettraff.ru/123?utm_term=gunslinger+stratos%253A+the+animation In PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/fudalokevagabu-fowozikul-topirimurisa-jopedi.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/nexofobe_dukan_nonozaguref_jubegesasipofaj.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/d581cd8.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/gSijFic/stick_figure_ninja_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/ggiighw/hitman_sniper_2_world_of_assassins_ios.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/c5a59423-07fe-45ad-a053-267038762864/pisidevekote.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/baixar_nr_24.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/lego_serious_play_facilitator_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/95104802057.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/radida.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 5180 bytes
SHA-256: bd49989af33997bdeb7cc24ad24f507f8287d86a92f0e5c3fee6cd88beced191
font_01_sfnt_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 10720 bytes
SHA-256: a0759d122512f0043d9b120d714ec0c5509a2e77de52405fa9f0986ab05868f6

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