Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec660533366bad9b…

MALICIOUS

PDF

102.1 KB Created: 2021-03-09 03:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bc98d86f5dec4cdeb54193e3977a7787 SHA-1: 73900fdfe76c64e04d90ebf8630349fdad43b4ea SHA-256: ec660533366bad9b987ef07aa9d579be8d186e2f9cb4fce13b6b4ac21363b77c
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • 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/award?keyword=aspirated+and+unaspirated+sounds+in+english+pdf In PDF document text
    • https://cdn.sqhk.co/gotirawuz/hdiifYu/zombie_sniper_last_man_stand_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/jEgi3ii/guidebook_to_relative_strangers.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/72467b5e-223a-44c7-b54d-7448745cad95/rukeruxe.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_cd6347713bcb4f0ebf3bab65969e11da.pdf?index=trueIn PDF document text
    • http://jaxiwupa.epizy.com/how_to_change_the_paper_on_a_sharp_el-1801v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6fdd92-3484-4e68-bc52-707d5ec80b8f/wezejedigege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32c260-6688-45cf-a64c-49a8bfd726f7/22830377472.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_5eb51e68cd914d6899500c36d50d42c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b709624-8a12-4050-8ccb-976639620bda/65713670474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd00429-e804-4419-8740-77d00557ad8d/41610353703.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_20907017c4cd43fbbfe7b28f90b0e0cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fe8304-9982-46df-a5cc-e7caf7afb2dd/33416022883.pdfIn PDF document text
    • http://godimodasixor.rf.gd/54393132681.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_438e2eecd72048dbbf1749189f67592a.pdf?index=trueIn PDF document text
    • http://bekisamusexasu.rf.gd/16784750172.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_72adafbcee01471f903ef7d27acd5c05.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_e66c728e3df941aa85e63c4d48229a70.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 3244 bytes
SHA-256: 9efb893e2e50170179ee308277ee49c98c50454e20f24c1801406171490e1002
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 5176 bytes
SHA-256: 7e1edf32e9f43e1e3387be30b6a1e846335413898e66c35c945fe15af5e66a99
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 16216 bytes
SHA-256: 85108bcd4c2c5181aa08b6f5f70d6736b482c26ab424d0e474c2d4b30dcfa56b
font_03_sfnt_off00015179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15179 18912 bytes
SHA-256: f0a8da77eb6b27a4ff144f7c706752419068634312954962d33e140342d1e8a3
font_04_sfnt_off00016f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F70 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_05_sfnt_off00017d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D70 2996 bytes
SHA-256: 8a1c7829a3a6d5f5f965e0574e41c9988d3624f38a8db2129b99dce8d604e872

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