Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c49113dd37bbbad…

MALICIOUS

PDF

81.2 KB Created: 2021-05-19 19:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bb114f4ee19fbbc46f4d27b6afe53da1 SHA-1: ecdc6dfd31099271e10ceaa5d2c389d441f4a4d1 SHA-256: 8c49113dd37bbbad7f08fa68ec428d704c714d96fb137a7bc7b5a8108946a9f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the heuristic findings point towards a phishing or malware distribution scheme disguised as a book summary download.

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://zajinet.ru/strik?utm_term=kitap+%25C3%25B6zeti+indirme+program%25C4%25B1 PDF link annotation
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/rodolumajos.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/zugop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_600b3c201a12a.pdfIn PDF document text
    • https://bulobazopikiju.weebly.com/uploads/1/3/0/7/130776241/619c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5fe9948b5f99e.pdfIn PDF document text
    • https://pekosorevonoxa.weebly.com/uploads/1/3/0/7/130739373/4578245.pdfIn PDF document text
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/4213976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_6019275d4ec03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_60275129293ef.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/wodibivufamedadegad.pdfIn PDF document text
    • https://vibemabejux.weebly.com/uploads/1/3/4/6/134668328/9534473.pdfIn PDF document text
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/aa733932d.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/7f1c86c4-cbb3-45b8-ad76-8f3401e1fd28/digiluvezejoxeluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc33d732-a091-4944-8fc3-3ffee16b1bca/apollo_250_dirt_bike_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02da9fb2-a487-4214-a66e-c687d1a64529/cuales_son_los_tipos_de_titulos_de_credito_que_existen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54507c0e-dfc1-4d0a-8f5b-811e0c61e64e/21112010616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e06b29-8046-41a1-bd99-54d2de4675c6/how_to_use_an_electric_smoker_masterbuilt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114ae334-ff7c-43ab-9f80-74494e703143/10979323620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd73f76-279b-48d0-b7ed-5c3f99ed84e2/39236966806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6211631-88c0-40b1-89bf-d00c153f977e/bixojibirunematux.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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 5256 bytes
SHA-256: 68f233b516aafbc934512d1203ca512f01e9d42da043afb26336d158b6c34654
font_01_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 12768 bytes
SHA-256: 8f38e278a49306fce3e9b2a8e27396bf7dc59aca2cf8fd554e069cde24308be3