Malicious PDF — malware analysis report

Static analysis result for SHA-256 b819661bb71eebd0…

MALICIOUS

PDF

74.9 KB Created: 2021-03-14 05:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1bda75d23c139dee6749809eba8a8a3b SHA-1: d19c34b935e4c0708f941e9c98ec39c338bf3430 SHA-256: b819661bb71eebd050c478506e953015e07645b4feaa6cad3aa4be2ed7a6e716
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one specifically pointing to a 'solving for x in congruent triangles worksheet' on a suspicious domain, suggesting a lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/wix?keyword=solving+for+x+in+congruent+triangles+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fc6137da38d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392872/normal_6004fcb9aed2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_6035e4449e438.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/update_android_samsung_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ffdc47f3ca6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_2b8939fa1a2049e8a28797bb21868c8b.pdf?index=trueIn PDF document text
    • http://sobisatoto.epizy.com/14517558839.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/town_building_games_mod_apk.pdfIn PDF document text
    • http://buloderijapu.epizy.com/arcai_netcut_pro_apk_cracked.pdfIn PDF document text
    • http://kotidaw.epizy.com/kuget.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_8ed9cc811bf8413395cfe85b27f947d1.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_26636fa366a1445f8cecfa244b5a2502.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_7954b9c339f94898bbce0643c79d9a3f.pdf?index=trueIn PDF document text
    • http://pepagipil.epizy.com/novoxozab.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_e27f9d1c3aa84bf29b029ac6a0944694.pdf?index=trueIn PDF document text
    • http://wegejubofiba.rf.gd/guxiw.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_0893ff0103ff4705aa3dfa62bc7b4691.pdf?index=trueIn PDF document text
    • http://zevofelajasuz.epizy.com/36709207787.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 5532 bytes
SHA-256: d02d3c60c28dadb02e7a32563b6892de709fd7343d4b6640d7b3134d8818bf03
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11892 bytes
SHA-256: 2184a462543a1f2802224808e49adfbe95e3fbce9b45e1a84e31bae15a7014a4

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