Malicious PDF — malware analysis report

Static analysis result for SHA-256 827c6e8aa911c424…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 19:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1b9bf168ee4938db267600f5ac5f070a SHA-1: 9a2fad0bed26d2f812cbf75b3ee8ed6f132625d7 SHA-256: 827c6e8aa911c424de9e8418ff1262a933c4fa9c3aba38286d6271565791ebd2
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/wix?keyword=tulip+victoria+instagram PDF link annotation
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/9483557.pdfIn PDF document text
    • https://rewazuxaroro.weebly.com/uploads/1/3/4/3/134341361/cec991c0bc0768.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/7Utgdge/17663236747.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/856d2.pdfIn PDF document text
    • https://kanapikimafu.weebly.com/uploads/1/3/3/9/133997195/saduxidapusewuzife.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fdca4e1208b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_60461bb1597da.pdfIn PDF document text
    • http://nelodorofi.iblogger.org/sm_blends_worksheets_free.pdfIn PDF document text
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/5f9220c2abedc.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/bhajaQd/fishing_hook_store_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_6008b12adca0a.pdfIn PDF document text
    • https://babunugigexi.weebly.com/uploads/1/3/4/5/134582988/josadosurubapiki.pdfIn PDF document text
    • https://gasulemuj.weebly.com/uploads/1/3/4/3/134352818/bomuvekezizo-tuwopunogaguzi-davol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff882759db2c.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/05256e.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadilinozo/ghT4jfy/igbo_kwenu_dj_mix.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/7189025.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/bZGjjie/wiworewatodejezotewegarib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_ec04c522a3114923a8b5b791d829ebc2.pdf?index=trueIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_e3fe90b45057452f8471ccbb476bcb2e.pdf?index=trueIn PDF document text
    • http://wolixebob.rf.gd/19492337476.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_3ac2a48f65e3476d8e01535a5638e8fd.pdf?index=trueIn PDF document text
    • http://dabemekos.epizy.com/medical_report_template_south_africa.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_77737da5bcfd4be7b625068ce89bf725.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_80d28643f7444d3981451384116cc35c.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5260 bytes
SHA-256: fa4af2324c66b906f12610f9447a0e37b815bf26bb0de8b3dbe5b5dada4bce58
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10920 bytes
SHA-256: 8176b9f18df3647ace614b6d082e25ecb25474d5d519c106d4e7d92bc76cea08