Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7f517708d14696…

MALICIOUS

PDF

78.3 KB Created: 2021-04-16 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a81c8ba406d68b0af14a19f6167a12c3 SHA-1: eec41f53854ac9570ccc460b4fda83e1d7e82cc7 SHA-256: 1d7f517708d14696471e18429564008820d055fa3b5e16906642f0d736fcfb31
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a URL with 'apple store make appointment for cracked screen' in the UTM term indicates a phishing or scam lure. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=apple+store+make+appointment+for+cracked+screen PDF link annotation
    • https://nerisowale.weebly.com/uploads/1/3/1/4/131412290/cc485c6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_6009faf0f0e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_605ef4be593a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_5fec5b30609a8.pdfIn PDF document text
    • https://linepofikoleku.weebly.com/uploads/1/3/4/4/134492010/9f30c816db9d.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/rimuwuj.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/wukikevub.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/07a836e224cd2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_60133972b537a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_600a577dcca5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_600e4bdd4448c.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/auckland_bus_route_map.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/welitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448339/normal_5ff8591fa76be.pdfIn PDF document text
    • http://kinerexasuxemo.getenjoyment.net/que_es_el_antigeno_prostatico_especifico.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/472949.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/bedixesan-newezulotatese-degebas-gunuzezerat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fe7759812d89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/paracetamol_aines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4958c86-777c-4c48-9c0d-25df0e9d1f41/how_many_editions_of_the_bible_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed826ed2-93e8-406a-b66d-cfae918fa1b0/47353814182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2672bf4-50ef-4214-8cb0-158ede9c99e1/learn_chinese_in_5_minutes_must_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f81992-0f21-477a-b278-530d12bafacc/susixe.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5356 bytes
SHA-256: b8868fd446dda897edf1d8ad50eab614f0810021db019308e35a2169180093b5
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 11168 bytes
SHA-256: a3c7faed9f05fd0e48885ba4d4ad63c0f1e1869fb9c1765730813c549cba75ce