Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefc288404de81b5…

MALICIOUS

PDF

100.5 KB Created: 2021-03-19 20:29:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4161289c25a777cf03be601b81e60e52 SHA-1: eba3181d9d79d7518088fdf58b07d4fd788be7a2 SHA-256: cefc288404de81b57278441f52ae6f5fa9eae85b9d7a3e99bbd94bd5609c1e1c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL suggesting a lure related to 'florida saltwater fish identification chart pdf'. This indicates a likely SEO manipulation or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external links points to the document's purpose of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=florida+saltwater+fish+identification+chart+pdf
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fe9f523e44b4.pdf
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/latunexeromu.pdf
    • http://nepatokada.mypressonline.com/tuludidunejuj.pdf
    • https://cdn-cms.f-static.net/uploads/4416918/normal_603021f9c6ad2.pdf
    • https://cdn-cms.f-static.net/uploads/4456989/normal_60334b15818d4.pdf
    • http://mukinumatonewo.getenjoyment.net/sun_system_accounting_software_manual.pdf
    • http://bekopomulasebi.getenjoyment.net/delonghi_portable_air_conditioner_pinguino_pac_n120.pdf
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/6160002.pdf
    • http://xevusezes.medianewsonline.com/35140852318.pdf
    • https://cdn-cms.f-static.net/uploads/4500200/normal_604d0c19eb715.pdf
    • https://cdn-cms.f-static.net/uploads/4417669/normal_6032837016913.pdf
    • https://niriretof.weebly.com/uploads/1/3/4/4/134488174/metuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/003265ec-ec9d-4111-b093-4233537b948b/white_tiger_netflix_storyline.pdf
    • https://uploads.strikinglycdn.com/files/fbe222dd-4c7b-459b-9e18-ef264c1b4f75/how_to_bake_in_lg_convection_microwave_oven.pdf
    • https://uploads.strikinglycdn.com/files/45386aa3-847a-4cb8-8d40-162c9509693b/what_is_self_reliant_mean.pdf
    • https://uploads.strikinglycdn.com/files/08a437ab-2d3e-4e88-ad6e-b8a370232a70/how_to_use_udp_protocol.pdf
    • https://uploads.strikinglycdn.com/files/24d7bbff-62d7-402e-9c8d-e7be1c1c94d5/best_dps_rotation_for_beast_mastery_hunter.pdf
    • https://uploads.strikinglycdn.com/files/b5b85fc4-c4eb-432e-9749-479bcab7ab8d/soduvizut.pdf
    • https://uploads.strikinglycdn.com/files/a11995d1-9f23-454e-98b4-70775e2f6ec4/47732577463.pdf
    • https://uploads.strikinglycdn.com/files/5866d25e-8072-49ed-8bad-9bf19434079a/blade_450x_parts_canada.pdf
    • https://uploads.strikinglycdn.com/files/b4bed0f7-fc8f-4077-84a4-fd7a82c68634/17115082588.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014973.bin
6dc50d4df783706d496482e562bab51127fcacc3d431c84671dba4dba1718ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 5292 bytes
font_01_sfnt_off00015b7f.bin
c4451720b35de9bb15489506f4188850451e95c9ca04e890530118969478e6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7F 11644 bytes

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