Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c3a590d65aa26c…

MALICIOUS

PDF

73.4 KB Created: 2021-01-15 04:34:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b75e276137b1a84c75905066823bd76f SHA-1: 4e85f8e447d9b1c463aac66e7daeee8b77c5b3f9 SHA-256: 57c3a590d65aa26cb986171c69ad3ff2b415bce64b68b688053c03f64f32adef
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=messenger+conversation+iphone In PDF document text
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/buvupizoxefuj_vuxid.pdfIn PDF document text
    • https://site-1172732.mozfiles.com/files/1172732/ashes_cricket_game_pc.pdfIn PDF document text
    • https://site-1171694.mozfiles.com/files/1171694/battleheart_legacy_2_mod_apk.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/5841211.pdfIn PDF document text
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/3a825d9f3.pdfIn PDF document text
    • https://site-1172565.mozfiles.com/files/1172565/2738707159.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/zidFEib/download_game_tug_table_mod_apk.pdfIn PDF document text
    • https://site-1168429.mozfiles.com/files/1168429/19552884553.pdfIn PDF document text
    • https://site-1176597.mozfiles.com/files/1176597/othello_game_4_players.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ghChhMy/ua_high_school_minecraft_pe_map.pdfIn PDF document text
    • https://gefotumazemi.weebly.com/uploads/1/3/5/3/135331531/xoxukugoleki_gadunisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/nilexewojaziwu.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/minecraft_castle_building.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/jazavif.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/vivaldi_summer_sheet_music.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_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 5228 bytes
SHA-256: 56496a1920f8e754b269ba18e5d2d1fdc93d27a8b6eab14050f6219756842989
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 10572 bytes
SHA-256: 54ba15075b7d791fad63df599a65c287d4962355d67f256ad333c1571598ef54

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