Malicious PDF — malware analysis report

Static analysis result for SHA-256 041a7bb6ab5f3052…

MALICIOUS

PDF

83.2 KB Created: 2021-01-19 11:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cba9d3cae0f5f019b7fb6b70891ee3f5 SHA-1: 6ffe20d7fbf392c3f6b4b911e0c98bf55182d8a1 SHA-256: 041a7bb6ab5f305232bdaa4a9001f683a6d7cc019759b40b2b4d22cb40314d1e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or redirector. It contains numerous embedded URLs pointing to disposable hosting and known malicious redirector infrastructure, indicating an attempt to lure users to potentially harmful websites. The file's structure and the presence of many links suggest it functions as a link farm designed to distribute traffic to various scam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://traffking.ru/wb?keyword=custom%20skin%20creator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f894931bc405.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/QqhfhjX/clash_of_clans_private_server_unlimited_troops_download.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/6796a6d4.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/jdfibhh/81922681625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_5fa47135ef3b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fe3f8a1329cf.pdfIn PDF document text
    • https://site-1174959.mozfiles.com/files/1174959/jobevumesuwasesarupor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f9a07f119085.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/55bbfd44.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/94004033798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424349/normal_5fc55b102e336.pdfIn PDF document text
    • https://site-1172627.mozfiles.com/files/1172627/dr__davey_smith.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/15294296556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fa0fc72a9412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5fad29f691adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fa7878b97f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_5fa1f3cde3901.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 4880 bytes
SHA-256: 5916ddf50a0d98871cb2cd395e074dd57ee9a9eab22207a9a01343499c1a801b
font_01_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 6892 bytes
SHA-256: 5cb2e1bf0187d20e814522aba6b7edc21b971a92c05b43a0b0a33349e6951000
font_02_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10504 bytes
SHA-256: cc165fa5a4df0aa37ce3f29ee8bff05363eccdf9194d54e45a9574ac7dcd5601
font_03_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 17324 bytes
SHA-256: 2653e3d8d0bb3e1b6401acd4caec77eecec601df3bd0cca9f1fdeb6a7c4eda6d
font_04_sfnt_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19