Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d3220ae5a8bde…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 06:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c6c4e7ae3576e329170063108cdd5ff4 SHA-1: e86a9e20a29093653a3b078936ea243aa9736666 SHA-256: 4a8d3220ae5a8bde59c402b0a89bc77dda3425db757f1ccc6fad68925f171fb0
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm pointing to numerous external PDFs. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to potentially malicious content hosted on disposable domains, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=2019+daytimer+template In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fe358bb83794.pdfIn PDF document text
    • https://lutigasudubuwa.weebly.com/uploads/1/3/2/6/132695203/vugazexoxemawefuk.pdfIn PDF document text
    • https://tixosagekade.weebly.com/uploads/1/3/4/4/134489061/bd8116.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/40520177703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5fd16e2f6d4e6.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/why_is_my_dishwasher_not_fully_draining.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_604a222ce12e8.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/79211540059.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/6701658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxigazejegoxe.epizy.com/virofokotojugekunexege.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/windows_10_bootable_software_free.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_3093d7be4c964522be3635be56e83d50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/mupituvow.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_668133d15202457dab33abbcdceb44e3.pdf?index=trueIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/contoh_proposal_biogas.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f58617092f9948d884bdabda26d6b9fe.pdf?index=trueIn PDF document text
    • http://wotonopeg.epizy.com/givadirunurikotovujamowa.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_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 5416 bytes
SHA-256: 17c395cd7ed3af6da7b9d288c999eac2eb8b102fdff9b4a282acec80cf572df2
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 10608 bytes
SHA-256: 25b0635a3d92fc440cd6fd21f3115a8c0411b8bf9a0405d4c25e043d71208118

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