Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8543b5d452a74d0…

MALICIOUS

PDF

77.3 KB Created: 2021-05-03 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 138d658322bfd30821714e9823a14813 SHA-1: 2517013985cf5c6d33ea1d70ef9bb885c715f4b0 SHA-256: d8543b5d452a74d0f5058cf792c9679a1b029cbc043c2f2d3f83331c2037ce3f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/strik?utm_term=diary+of+a+wimpy+kid+free+read+pdf PDF link annotation
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/0551207e153.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/4hhpgje/meetlove_chat_and_dating_app.pdfIn PDF document text
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/757482.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/jiig0Ug/likexoberuvununozasa.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/widgds2/20666457471.pdfIn PDF document text
    • https://cdn.sqhk.co/bijilixiger/cMmUo9b/kill_bill_flute_ringtone_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/3ASlicX/dokafu.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/jggiLtc/78740535542.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/sovilo.pdfIn PDF document text
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/9656075.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/iigjbja/chromas_pro_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/dfNypjf/43759736988.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/igMMib6/89720723809.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://s3.amazonaws.com/xefejevife/a_weekend_in_amsterdam_guide.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_b725730a0264485983055c9e8cf05925.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/28018925280.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/rug_doctor_mighty_pro_x3_wont_spray.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/naming_alkenes_practice_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/everbearing_strawberry_planting_guide.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_59f571741cef41d8a968d699c03e0738.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 4836 bytes
SHA-256: 9d59915297adbdc19eff08a12781c3a023f7ca81e77d6c0ad4e88654d6bb881e
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 11456 bytes
SHA-256: 89f7c3649bb24e4c1466fcdb59b5f74a48d80030dc150c6bf4a757fe96c04462
font_02_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34