Malicious PDF — malware analysis report

Static analysis result for SHA-256 94542e42cdafea65…

MALICIOUS

PDF

106.0 KB Created: 2021-01-18 11:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4239fc3554f7b543d62e74c1b38a25c6 SHA-1: 301a745dc9bae61cd109393628c97b38118a09e6 SHA-256: 94542e42cdafea65f545f4e1276de5f1cb6c83aededc7c3495545ff559043bda
244 Risk Score

Malware Insights

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

This PDF file contains a large number of links to external PDF documents hosted on various disposable domains, indicating a link farm designed for SEO manipulation or to distribute malicious content. The presence of a known malicious redirector URL and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The file likely serves as a lure to trick users into clicking malicious links, potentially leading to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://yafferge.ru/wb?keyword=bass%20pro%20booster%20tube%20apk In PDF document text
    • https://nanawoxemataxu.weebly.com/uploads/1/3/5/3/135332584/gevoduguvivu.pdfIn PDF document text
    • https://site-1168148.mozfiles.com/files/1168148/pewonexurenoniwipozov.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/triominos_free_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486975/normal_5fc2c1e24fdb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fd7d66968209.pdfIn PDF document text
    • https://site-1168276.mozfiles.com/files/1168276/revijuxubijolibuvev.pdfIn PDF document text
    • https://cdn.sqhk.co/lokalofobox/jeieOTY/emergency_weather_alert_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/qjiLPji/smurfs_village_magical_meadow_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475563/normal_5fc2caaf0b203.pdfIn PDF document text
    • https://site-1252641.mozfiles.com/files/1252641/23477382304.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/a705a7f01c.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/cngcpjd/67492214185.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/ak5fifv/new_failarmy_videos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff9294defe84.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/nomemukufed.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/jbifhit/94725890497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424378/normal_5fd76d209eba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016f19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16F19 24432 bytes
SHA-256: f378946477ab2c30875bcdbac9bb41766d1ac2edafb55765c16e9dfe2c526aa8
font_00_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 5036 bytes
SHA-256: 1dc2caa52dd2c8dc01fe3a850c3b964f08aa9307c15264e48b17be5bb16663b5
font_01_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 6892 bytes
SHA-256: bede2664cf8d758157ee571388a4eab25cf75e6ee042105b8f32f70f34ea0233
font_02_sfnt_off00014657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14657 12300 bytes
SHA-256: d9fbdc82eaef865356e232c4526855e10d30e4c36fe5bf76f0f353e0000d9372