Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2315493446c6c7…

MALICIOUS

PDF

83.8 KB Created: 2021-03-13 13:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3d37beb3c6a55c0b6c061f57aab7da31 SHA-1: 0a8133545dc22c581d5ab59d8e0fcb4a015f6785 SHA-256: 7a2315493446c6c7cac684657382aa443acb7b23bfad589047a1d80aafa02f89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/wix?keyword=biology+textbook+scavenger+hunt+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407810/normal_600e6aa539099.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/higfghR/smart_balance_olive_oil_butter_reviews.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/folumusivep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60354c63b3d86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385217/normal_5ffca2c0d07ca.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/kozefa_xanaxatudib_wasikejujamu_sefesalojoxir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_602b422d64e1c.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ghPhbhh/piparejavaloxafib.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/be8DAhf/vobikuwiguwa.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/mijut-wevudelulop-kakifixoso-lominexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_60365700ae802.pdfIn PDF document text
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/fatakilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fee137-313e-4299-9a3f-256f4b5af782/weber_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/dr_jekyll_and_mr_hyde_2017_movie.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_81354cb18a6e479d85f44f0b2c44036e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b7ff68-fe74-466d-a799-4e22c55541ed/holt_handbook_fifth_course_chapter_3_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbf1568-77f6-488c-bb46-529700997a9b/early_bird_restaurant_phone_number.pdfIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_959f7df0476e4d8e95e910a1ac0d1310.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3229c70b-7837-4ef4-910a-fa0618fa985f/how_to_install_electrical_outlet_box_in_ceiling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf35475-0c15-4bd4-9bdd-7e495ed657ce/semagatikigufazafomo.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/lifotoretike.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/24117086518.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_8dd7e2e65ae54c39acc2b5966dcc2737.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 5636 bytes
SHA-256: 395b59de8ed72fd42773591ec3cbc066382c935922a09ef10bcd57a5a099a622
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11016 bytes
SHA-256: 20dea1cef74e77792191757b8bfd7a62f66385f1369173ab8d5ddb7cf429cf2c
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073