Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6baaa410e5a714…

MALICIOUS

PDF

138.5 KB Created: 2021-04-13 12:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ec16959becd5f5aa20d99e5d1496c27 SHA-1: d72ac5cbee3528e9735ed3b8c0a63f25e45eb45b SHA-256: 1e6baaa410e5a714405b2dbf3d9ade33d614d5f5e22667f8a7cca039ebadca4a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9961

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://resalured.ru/strik?utm_term=arabic+verb+conjugation+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/zivuputid/pN9qiaS/16643833696.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/a424d3540c6.pdfIn PDF document text
    • https://pimelitapata.weebly.com/uploads/1/3/1/4/131454500/d69b6.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/Z7oTif8/fobomabifezebakexowum.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/bisoti.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/menub.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/iihfgfm/40817248607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_602e42bdc822e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474470/normal_5fef8af361c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_602ab3b132751.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoziku/45jfgdC/wolf_online_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407989/normal_604a108996c53.pdfIn PDF document text
    • https://fudatavog.weebly.com/uploads/1/3/4/8/134894714/3258410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_601baf84da15e.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/povidifivufuvo_lajifejanefo.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/busutafitufe/ejemplo_de_memos_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/what_does_federal_limits_apply_on_a_california_drivers_license_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/90653580440.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/rinefidatitum.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001dfe4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1DFE4 23580 bytes
SHA-256: af9a60bc84d59eb1727c700d30ba9472d3f916c6a67297d0bd75d11925f92318
font_00_sfnt_off00014f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F17 6808 bytes
SHA-256: 1d088d28ae1a31a4b13adcac6ab268b594f4937aca720c181bc7b17401857a4b
font_01_sfnt_off00015ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 5464 bytes
SHA-256: a5edaed2401612c580cd057bfd43104d57bff4c2620b16f82bffdce1e55f757a
font_02_sfnt_off000172ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AC 5808 bytes
SHA-256: 168b2e8dd970295d40b11f55c4d2e0b2fa1f26ba2829c7d02121fd26f1660441
font_03_sfnt_off00018645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18645 6396 bytes
SHA-256: da10f500b3fba9cec86e9f6a462cab340099197182353625ece9fe48d6f5b706
font_04_sfnt_off000195d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195D3 26708 bytes
SHA-256: 7c50e74e738bf1a556ed82e7ccc11bd183813127c303bc50700ac0f7a3415558
font_06_sfnt_off00020b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B1B 6152 bytes
SHA-256: a03ca211db6d3651eae36bdc97ba376d7b9b05775f8fe40ce344a86e2ab0f860

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