Malicious PDF — malware analysis report

Static analysis result for SHA-256 89adcdb2dd92e01f…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 10:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4aa65af9aba21a6f6d04435c01001a92 SHA-1: a5340574120be33d71636e5442cc77ebd789d716 SHA-256: 89adcdb2dd92e01f90c7bbb31d095d3129bec7bf3a3cbec1cc1e31b39034fdcc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially garbled, contains text related to scanner setup, which is used as a lure to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+set+up+a+uniden+bc125at+scanner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc63ea1d3362.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/2346148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_600f977059902.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/jodazokidub.pdfIn PDF document text
    • https://sojinunanujiwok.weebly.com/uploads/1/3/5/3/135311630/8461026.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/453260.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/vaxanajupizekerepusad.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/fde7cd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6036de0651676.pdfIn PDF document text
    • http://italystore.pro/christmas_words_in_spanish_worksheeth0loy.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/kaponekaxa_vumageneme_mubow.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/57cb1ad0-15f1-43d2-bd95-f994fa716084/what_is_descriptive_analytics_prescriptive_and_predictive_analytics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f697a7-c6a2-4690-ba68-374744b6a9b3/uppababy_mesa_car_seat_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57df622-a97a-4290-99e6-50b06046b19f/sports_illustrated_cover_dec_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f2f7ff-dd4c-4657-a8ee-29195094731e/how_to_get_atem_software_control.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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 5536 bytes
SHA-256: 82f4adb1b6238bef7cb66d88d2a430d977c0f0e4436ae6339b0424e8d9e200bc
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10944 bytes
SHA-256: f6cc293bd29f927acfae6c491482d15afc8a9db387df758ab91c595f22f2cc7b

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