Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1142b6cffdbdefb…

MALICIOUS

PDF

66.6 KB Created: 2020-12-08 19:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 862930915842c4e4416efa2b8f7c76ab SHA-1: 1026f0bbf67c5647b6a8fbf8fc449bc77bac011c SHA-256: d1142b6cffdbdefb3cb174773fbcb37d1a4dc9bf7b2299127ae0704b138f7a86
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign resources, but one key URL, 'https://traffnew.ru/123?utm_term=stony+brook+loews+amc', is flagged as unknown and is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, suggesting a malicious intent to obscure the true purpose or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=stony+brook+loews+amc PDF link annotation
    • https://nujawarasut.weebly.com/uploads/1/3/4/3/134310583/febizuvoroxijamo.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jinekunomejami_tikanupidofe_noladuneperuru_xatajugakivomul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_5f912488b8670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5f9c79e82d494.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/db11833d-998c-487e-953e-67e922147d0d/types_of_black_birds_in_pennsylvania.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/dumodozedude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be913a1c-dc20-4e07-a0dc-b38838326fc9/34020802834.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/mahjong_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/bridgestone_hoa_cedar_hills_utah.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54de5d26ff1194f911033/t/5fc7d2a90a80c24503df6f72/1606931113935/dofekotamobajonugivi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf51cdfa04221c71170ed1/1606373838803/kidkraft_uptown_espresso_kitchen_assembly_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186f06bf-7adb-4b03-b13b-c75c33802d09/74636026039.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/mogironidaxenimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ba288e-0e3d-4c44-8212-216cb5aa26c4/rockfish_hoke_elementary_school_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/fifidejovuwoger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24366132-cf26-462c-b34e-612af6963805/jokedotaxife.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc0facd145a8629dcd3f518/1606482640005/what_does_it_mean_to_be_alive_worksheet.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_off0000c7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C1 5448 bytes
SHA-256: d4b9e49d3c875a8caf893af7d8d42f74bd5b328b99a5305dcc060671e018dfb2
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10260 bytes
SHA-256: 426db8ac19a50cdc86cae79046695c5bede401175099985a7b6a103374b85553

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