Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215b3ae96566fe8…

MALICIOUS

PDF

79.0 KB Created: 2021-02-15 00:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c814e3cc4d474fad4ba125ff81feb530 SHA-1: 98b1003d9d5744c18ea875be27b79d98c68f5c3d SHA-256: a215b3ae96566fe816f2c7ac6ba55b73664ddab169430f3ec083d7057b4cde0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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
  • 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://crophysi.ru/wix?keyword=thermodynamics+worksheet+answer+key+physics PDF link annotation
    • http://lomags.ru/fabfitfun_affiliate_login67hk3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383679/normal_6001a9647ed14.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/b5ad6e0298.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/8380154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_601ca4b5b0bd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fd11af71629b.pdfIn PDF document text
    • http://golden-bridge.pro/8981356331ytk15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_6028583788547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fe1ce8daab53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5febb57376aa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff64febad5c8.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/sovuwaxujana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fe42f9b916ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_601d82da35aa1.pdfIn PDF document text
    • http://pokupka.space/sustainability_report_2018_ikeacy730.pdfIn PDF document text
    • http://moshon.space/dofolivefeloluzegi0i19y.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/laws_of_gravity_movie_cast6pbwh.pdfIn PDF document text
    • http://busivel.xyz/kixerurawoxakiwizugudemhb8j5.pdfIn PDF document text
    • http://copyright-infringement.business/18264040547mxx4j.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimodamugirad.rf.gd/wezilasilewifovewiduga.pdfIn PDF document text
    • http://lanotiwigizoxep.epizy.com/bangalore_telugu_video.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 2460 bytes
SHA-256: 8000127d219a638326d977868f7fa4cdd56464c84e448021f2d0dee65eb19dcc
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 5488 bytes
SHA-256: 086b7c1975e3788d4cc120bd029c582eb415df48a5200f0d70b82f8c4033fd09
font_02_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 10348 bytes
SHA-256: 0d5e636c331b66ecfd3b4a0f7011fc44a7d0b37615b6dd8d2c548a64870b5fb5
font_03_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 16180 bytes
SHA-256: 4bc4a87b86938a42555e25efc86e010a3c2a045b118fb9fb107e112fed3f0d18