Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f593fb62e9a1f54…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 10:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cb5e503f053c0c8fecdbddbb0aa44d69 SHA-1: e9732c79f98fedc10f4524cd1033fd5c3f52fcfc SHA-256: 2f593fb62e9a1f5437b510971975bb4bdfb8d66a192306e3b3531c0a71267bed
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious sites. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded links, such as 'https://nipisod.ru/strik?utm_term=usps+international+mail+postage+statement', suggest a lure to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=usps+international+mail+postage+statement PDF link annotation
    • https://pukiroxe.weebly.com/uploads/1/3/2/3/132303351/felotexodizoj-lexidigusiru-bovukibafutu.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/4ccf53.pdfIn PDF document text
    • https://zokaduxenatased.weebly.com/uploads/1/3/1/6/131637020/gelaxuvekof_foxafo.pdfIn PDF document text
    • https://leborulixa.weebly.com/uploads/1/3/4/5/134503619/bcfc46b.pdfIn PDF document text
    • https://suwitasejamuk.weebly.com/uploads/1/3/1/8/131856391/9206148.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/fa0c275aff.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/sufuwebekigirijude.pdfIn PDF document text
    • https://wisixujedos.weebly.com/uploads/1/3/4/7/134732494/vimisigagivazalug.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://uploads.strikinglycdn.com/files/10d49130-723a-4f4f-a3bd-13c165b9bf19/xinafufujirameson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f55c5b-b62f-443b-afe4-9e83d7cdd3cd/68344688989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8572a9aa-ea12-40d0-9622-a31c202466b4/john_deere_d110_steering_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfe4067-79bb-447a-b0b1-13fa12e6e152/90248355960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a69e86-c377-458f-8cdb-b907dc137d0c/6830114296.pdfIn PDF document text
    • http://wojenubenizega.epizy.com/class_10_maths_ncert_solutions_download_chapter_4.pdfIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_f6c97c7f372d400bac77da3ab5430f4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98097c5-cf11-41d0-bb29-6d0dde420fef/24009593077.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/jasper_report_designer_tool.pdfIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_0b86fc3c82b94964a047b2943ed10cb8.pdf?index=trueIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_c8dcdb0d1d30460185a8bcceef23eddb.pdf?index=trueIn PDF document text
    • http://kudinezajaw.rf.gd/holy_quran_arabic_to_english_translation.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_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 4916 bytes
SHA-256: 1dfac8b8c854a0762033976e33791299d4d5514d14111e474fca411d7f985a7e
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 10432 bytes
SHA-256: e8ca29d32d78b84b8198c82bc1667ab866e67f49bd45979e954ceb8db132187b
font_02_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2