Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b670d96573b371…

MALICIOUS

PDF

67.6 KB Created: 2021-04-05 08:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 72ea197375db96cfeb82a532dc1054a4 SHA-1: 2c4079d0481ce2090b1b29f43de815a9e5209db4 SHA-256: 55b670d96573b3711d9afacf416b2e0e61ff12008d2c7f3f3ac75bd09b7ab5e4
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The primary malicious activity observed is the redirection of users to external, potentially harmful websites.

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://dafemum.ru/aws?utm_term=how+many+reps+for+bodyweight+exercises In PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fe26e73bdfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5fd994c7d57cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_600636f3453b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fd619f3a8373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_ed6686da4c114645830203cc1254d722.pdf?index=trueIn PDF document text
    • http://bufareloxejigu.rf.gd/jatulo.pdfIn PDF document text
    • http://tukuzadixejune.epizy.com/ibps_rrb_notification_2020_bankers_adda.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_bfc372a5d59b489dbfc91694d07a8bf1.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_d4afe10fbf1f4e3bb325394d018a57f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/numerical_and_statistical_methods_with_scilab.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/can_access_internet_from_mobile_hotspot_windows_10.pdfIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_cf787255348b41a68cb7881d8e9629e3.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_7f16bf269cb2475597499bc1ebdb4f13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/the_secret_dare_to_dream_ende.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/mandatory_reporting_policy_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/luminosity_beach_festival_2018.pdfIn PDF document text
    • http://zujifonep.epizy.com/how_to_speak_english_fluency.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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5900 bytes
SHA-256: f1ce5e66a2ff72e7181b9231adb8b569b1f02cd85eada639332df2420b50b0a9
font_01_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 9984 bytes
SHA-256: 5bf4424b0b6d35ee8bddb82b468ab701f9ad88b56ce0840f8874e7ebe3871e39

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