Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87dd909071befee…

MALICIOUS

PDF

95.7 KB Created: 2021-03-05 17:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 58d5cceacadf5ba6c280ac63e22b56ea SHA-1: 144fd313f82ae707c2cabb31e02498e7e35f1d86 SHA-256: b87dd909071befee0287b863a93be31241c7bf62b588bb266b551be8a6c8029d
186 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to contain keywords related to a game build, likely serving as a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/wix?keyword=swtor+jedi+sentinel+combat+build+6.0 PDF link annotation
    • https://cdn.sqhk.co/pesegozod/hhdhehg/jinilo.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/bgdqhfL/rent_amc_theatre_nyc.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/how_do_i_connect_my_hp_laserjet_m1212nf_mfp_to_wireless_network.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/flowers_in_the_attic_series_in_order_lifetime.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/aiahbhi/feasibility_study_approach.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/fawakufivopanetaruvajar.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/02c947e9-feeb-40c7-a624-4a0173069a85/how_to_disassemble_nordictrack_c2200.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_13037b81baa54990ba40138b9fd69990.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_362392e91a574fd78aec270609df072d.pdf?index=trueIn PDF document text
    • http://nabenejajoko.myartsonline.com/87115127667.pdfIn PDF document text
    • http://luzawuwu.epizy.com/judicial_review_political_cartoon_answer_key.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_fe21aed9d7a24287b9aa2218eba84715.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_5c04222718494c9a81a829e5c6b83bf8.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_7f43bc6480494d21b371d1cd609bc8e6.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_7310033e8c294743a6b8ce47b0efbfd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9691b11b-04ca-4d8f-b330-95cedc8b9956/john_deere_x300_owners_manual.pdfIn PDF document text
    • http://fuxodenajakifut.epizy.com/cesur_ve_gzel_mzikleri_jenerik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5511685-fc3b-40a2-9f35-539698f98f75/google_chrome_flash_player_after_december_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ae50ba-6bce-4d6a-89d9-2efd9b610768/how_to_open_electric_fireplace_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beae65cd-7e25-4be7-946e-9128380a0924/line_6_pod_hd_user_manual.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_off00013874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13874 5824 bytes
SHA-256: 583fab39b60bfee1fe46839a89aab8faff283099853bd4064bf991bf3cbe436c
font_01_sfnt_off00014c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3F 10976 bytes
SHA-256: 74a2fb1c612ec18950642725683567da80cd8928f4a83b1bda820a91664155f2