Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e699f274096359…

MALICIOUS

PDF

69.6 KB Created: 2021-02-16 12:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa0254283b9c65911b2db864494bd6b8 SHA-1: 67f43f5e073d3b6fadd643aaac6c01d3821c7931 SHA-256: 55e699f274096359cb10f65a16de91c2a88fc568967140bee923e04ceed67d1c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of multiple links on disposable hosting suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and link analysis strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=minn%20kota%20ultrex%2080%20ipilot%20link%20mdi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_6015303d790a0.pdfIn PDF document text
    • http://prolac.ru/449877478579feli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_6024007551a25.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/pumuwibe.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/ladumijota_pesogezipi_parexejufivegej_piwutijes.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/hV217Eq/rock_hero_2_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/pgc3jhx/chess_openings_for_white_aggressive.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/febure.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/3a5270823.pdfIn PDF document text
    • http://findattime.com/53456571284qiwtg.pdfIn PDF document text
    • https://vobiromab.weebly.com/uploads/1/3/4/6/134653190/1239331.pdfIn PDF document text
    • http://itayoga.space/gijujadaxojorizigidoxez1qndo.pdfIn PDF document text
    • http://bettermoneytips.com/make_your_own_cupcake_wedding_cake_stand4xlt1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxalotivip.epizy.com/10960110562.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/kuladovixefugibivuzobozu.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/berserk_2017_soundtrack.pdfIn PDF document text
    • http://nibewisule.epizy.com/fishing_report_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/ralink_wifi_adapter_driver_windows_10.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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 5400 bytes
SHA-256: fc4abc1874c033e0671267b23eef52caace54a5d6bf4d0c2278bf4d18f77dde3
font_01_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 10188 bytes
SHA-256: 261faeb1512aad8d2f5b99ae356d2498d75dc8b59a165b4ede1c9e726ea0deac

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