Malicious PDF — malware analysis report

Static analysis result for SHA-256 4338a6f1c45e10c8…

MALICIOUS

PDF

77.9 KB Created: 2021-04-06 19:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e8d00f4ce578d69d739a025faec66b3 SHA-1: 724d727d6aa07785fe53ec16f4c612debac2a0f6 SHA-256: 4338a6f1c45e10c8327f9328ba8da4ff706ae757c08861d380bdbc14ed33140e
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 0.9996

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://jacksth.ru/aws?utm_term=richard+iii+play+themes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368989/normal_6041a4c422de8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcc5d8ddd785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_6041d2ad25f1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_5fcf65eb8e4c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5fdf68a3e6c66.pdfIn PDF document text
    • http://vibigobefe.22web.org/reporting_mann_whitney_u_test_in_text.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_6044a04aee213.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/jutenojamega/how_long_to_learn_computer_networking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b31867f-f97e-4409-96c7-ab8a2e662ae7/how_to_remove_hot_tub_cover_lifter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f443ee9-be68-4882-823c-77b005f448c2/interior_design_masters_degree_canada.pdfIn PDF document text
    • http://vupafigimewex.rf.gd/87946456600.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/decision_tree_algorithm_python.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_67b86a199f504b6cb63761c755807205.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/zepewibozagejiti.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_867557f805e44217ad1e11d26335716b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d080d58-97ca-4601-b744-15d3e0a45117/86989890993.pdfIn PDF document text
    • http://soxomipimumoraz.rf.gd/banjara_song_ek_tha_tiger_320kbps.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/area_and_perimeter_of_parallelogram_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ba671e9-82f6-4df9-a226-1659c55e642b/lazelolugodivanugeruwaban.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_02b94f4fc4d4459b87f35d1885b852ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kofabube/android_recyclerview_viewpager_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae1c8a9b-61e2-42ba-b20f-458b167f20f2/88496970046.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_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 5424 bytes
SHA-256: 9d1a59950455b43b9c6894622b974429ebf3612eefb638e82671b172e0bb8999
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 10968 bytes
SHA-256: 1c2b0ef19e5ab2df5511d709feff002d97bda19ad8baf9605b1280d9a5c5180a