Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9ea26a7935d8e3…

MALICIOUS

PDF

82.7 KB Created: 2021-02-13 10:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 91d181b25739d03108dd0ece869ebd28 SHA-1: bf88a59f5f0225610b8af52ae365e81d24df4500 SHA-256: 8f9ea26a7935d8e3c76ee8d13fd46d99bf8727570ef2717f1688759a51f70756
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. The presence of embedded URLs suggests an attempt to direct users to malicious sites, likely for phishing or malware delivery.

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 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.
  • 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=thinking%20in%20java%20book%20pdf In PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/2560659.pdfIn PDF document text
    • http://itabody.space/nerf_cutan_latral_de_la_cuisse_douleurgigln.pdfIn PDF document text
    • http://jodesomuxuduzu.22web.org/beyonce_the_gift_album_free.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/dibaki-gekufinapiva-fexafonatub-mizusu.pdfIn PDF document text
    • http://reduslimitalia-official.website/smoke_and_mirrors_song_free82w25.pdfIn PDF document text
    • http://ver-alex.website/hangout_with_yoo_episode_64ej2fw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_601b3209792ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_600feb0ce5463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fddcee40d3e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5ff1f422ddbff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_6021a94ec3e87.pdfIn PDF document text
    • https://mezamavizasiv.weebly.com/uploads/1/3/5/3/135312133/6551470.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/xovekolamoxe/google_chrome_app_for_android_2._3.pdfIn PDF document text
    • http://mafivofadol.epizy.com/32805403283.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/foolproof_answers_module_1.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/business_meeting_schedule_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/17518113319.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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 4876 bytes
SHA-256: a5e8e1ad9d01ba6e72b09ad4b56cb72547e3b9f0b65c596e67006674052f8fd7
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 12696 bytes
SHA-256: 7beba47fa6a091e3962f6670feeaab6ea13aaa1228a23299589bdd7954e67e52
font_02_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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