Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4a46fb5f7899bd…

MALICIOUS

PDF

72.2 KB Created: 2021-03-30 10:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39ad232cdddf8ad966188c0880762b95 SHA-1: c598b4fc998256846bc3c54b0538a4d94af42c4b SHA-256: 7e4a46fb5f7899bd553d4bc9c70007dd01a1cfe6c2b7ece0adcfeaf0a1564ce1
186 Risk Score

Malware Insights

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

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 0.9995

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://midufefew.ru/award?keyword=analytical+reasoning+questions+for+nts+test+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386073/normal_6006e3c73d02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_600b009f5d416.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fcf2b72bee0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fe993804165f.pdfIn PDF document text
    • http://lofitner.buzz/android_studio_change_icon_name02k9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_5fe83dd433325.pdfIn PDF document text
    • http://ductsunlimitedins.com/epson_wf_2540_wireless_setup5m7ox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_603b4932cfa11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481286/normal_5fcae87330dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_6018407d39d82.pdfIn PDF document text
    • http://reawolt.online/how_to_turn_on_blackberry_classic6r2wy.pdfIn PDF document text
    • http://5dradio.ru/31017132522lr917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379987/normal_5fdf0feb32abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456132/normal_5fe3810bc3fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_60210a1a6f9a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_60072a1765fd0.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/strictmode_policy_violation_android.os.strictmode.leaked_closable_violation4yflp.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://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_214524ef6ee845549599f40fb2b42f97.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_31f71d2693b34e248075bcb71570a9ff.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_b5775816c5d54fe98fe57967ea3e2878.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b31350-4f4e-476a-a404-639f6373efcc/kapikerozeloruzotomegek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/937da71b-e8a3-400b-b549-e881eeb8960a/91150633049.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 5424 bytes
SHA-256: 9a2d6dc18488d820089b1e28ec554b0e3a9abf0065e2d9d85e29e57e18d33513
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10496 bytes
SHA-256: 4e9e9d950a67b43a91289a6ab73bb5579c5e344b204e572195db4de0aca0ae6a
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3