Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac86ede119b667d…

MALICIOUS

PDF

86.3 KB Created: 2021-06-06 13:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ad7939a2a101c806fe0d13be52dda820 SHA-1: 124299d7eba2f598cde5c6c61a30a34ad5976a97 SHA-256: eac86ede119b667d6b8a77a84c5c9ce1df06f08cd125099667cba770456615f4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to PDF documents hosted on disposable or SEO-focused platforms. The primary URL, https://crewmak.ru/pbw?utm_term=public+law+97-280+meaning, suggests a potential phishing or content manipulation motive. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=public+law+97-280+meaning PDF link annotation
    • https://feruzizujuvete.weebly.com/uploads/1/3/0/7/130775768/33c52c.pdfIn PDF document text
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/3991700.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/9b4cb2.pdfIn PDF document text
    • https://xotukejurivaj.weebly.com/uploads/1/3/4/0/134016857/2749578.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/075eee25-ef1f-4ab0-8562-73afa1fefea5/42637885134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66024da2-2c60-4349-b608-45033e1d6cae/divomigebanigezoza.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144649698/what_is_act_1_scene_2_about_in_julius_caesar.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/w/file/fetch/144702801/practices_that_support_diversity_equality_and_inclusion_in_the_workplace.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/gimafurubufezepuzej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20002066-f66d-4d3a-9422-960f8a3726ba/podabolu.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/ejercicios_de_adjetivos_calificativos_para_nios_de_tercer_grado.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144673308/variable_expressions_worksheet_answer_key.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/21077987014.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/w/file/fetch/144506619/15117866355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fff5510-6d3e-44e2-b03b-ac2858728b85/72301368954.pdfIn PDF document text
    • http://razodegotit.pbworks.com/f/roblox_free_robux_hack_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89c5b81-5d4f-4ee4-a699-df9f1d0cf07b/reizen_talking_atomic_alarm_clock_manual.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144518577/lamivapagavavimesiguzugij.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/how_to_put_together_a_sole_e25_elliptical.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/w/file/fetch/144699912/29029457810.pdfIn PDF document text
    • http://juwelite.pbworks.com/f/web_development_course_udemy_free.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_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 5812 bytes
SHA-256: 9ed6c24ea07f4e8518da261416a77cc7fb2b4b96b578dd0943671bd0657c3afd
font_01_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 11164 bytes
SHA-256: 4c20d27d98ba1f8ac553b8145347a0afb6aafff1223e9d044d4f712a065cd230