Malicious PDF — malware analysis report

Static analysis result for SHA-256 1115e24021b1d7fe…

MALICIOUS

PDF

76.4 KB Created: 2021-04-20 15:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cab478e81d75997b539a3c57fb41c010 SHA-1: 58bc86ae7a12032543c1c605b6ea696ae06a5bed SHA-256: 1115e24021b1d7fec115952e3c23d7c8fda28be85e6aff960d4fa9782f203e8a
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://fokemale.ru/strik?utm_term=carson+dellosa+math+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368741/normal_6044fffa01385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_60551278053c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_5fdbb7f16133a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_606e4678e56dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6029dff6d73e5.pdfIn PDF document text
    • https://cdn.sqhk.co/fagojefavap/ibhbVf8/flight_tracker_app_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_602c21e9774c9.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/9GgcBwW/download_grand_theft_auto_ifruit_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_2ce13a3611f44e92ad6c5b63bbbb57b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14906562-f0d2-41bf-bcf8-78d856085476/nobugo.pdfIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_7bb0e8163e6444efad4fe90927d60841.pdf?index=trueIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_65c4eadac11b4e5499148c75fdf9d111.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68647fab-3c65-4e7b-913d-0c3b78fc91aa/craftsman_917_mower_parts_diagram.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_6df17a1548d44e74bba0c9e60d1ead32.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_003131a9dc11409fa00df41e4fa4ea29.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_5b82842b9d39424fa47a3bf4d1899be7.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_d1005ab5e5654ea6b1693a19177e7634.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_1471b53746de45a7b460dc3f183caca3.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_0a6efd9fc03c4dba97b317c3ae7950d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0261eb5b-b7fc-4fbf-9ef4-a476ecacc967/how_to_put_music_on_nano_ipod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 5044 bytes
SHA-256: ff7b8c0a3307c2fa4502c26f663537fcd437ab8c0fcb10b1158086b119bb3074
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 11108 bytes
SHA-256: 68982221e2fb22a081ac0dd80dc1150236f2c4fdf202549cc9b671bd6482c5ef
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333