Malicious PDF — malware analysis report

Static analysis result for SHA-256 c440d5dd3204eeb1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 01:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 120139ac4a19bbee32a4b862c5160863 SHA-1: beca4025b5b3ab508f2e5a2e8a63e0a42d834a39 SHA-256: c440d5dd3204eeb146400e28befe60371b362e51c0c2d41ec4ec7ceec6d8c65c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate maliciousness, specifically a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=hawkeye+10+conference+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461780/normal_60314d3782563.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/30a87c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fe165a82f554.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/2622413.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/6441430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_60332432e978d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393034/normal_5ffc7a597b009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fe5651fa6c4b.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/8d1bf357.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/rufonali/rariko.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/scheming_weasel_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/84845370361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d957d4f5-b13e-41fd-806c-59523a59ce70/coast_guard_approved_medical_examiners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5835320-8a53-45a7-b82a-d992d64ad533/indian_non_veg_recipes_in_hindi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4476bc88-f149-486e-b7d5-151a0507b359/68135133524.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/red_orchestra_game.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/giguneja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bb4a3f-ea7d-4357-a0f8-65f841a8e271/how_remove_samsung_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/liwopetivetese.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/how_to_use_a_speed_queen_commercial_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/ledanoxizefulirijabumefod.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_off0000e07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07F 4908 bytes
SHA-256: 84330d23364c611bcba37c17718c92a5b2ee3c1edc3ca7a8d88c4c474307c5f1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 10896 bytes
SHA-256: 4f535492a12f3fc4208f5b0d0100615f081aef20860fe840b78768a3d874a192
font_02_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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